more than a million dollars was/were spent on advertising. 應該用was 定were?

A. 依如下Link解釋是都有可能，實際上查尋紐約時報以(more than a milion dollars was/were)查詢用was為9用were為1。以Google Search查詢用was為18,400用were為10
說明檔及重點摘要如後
https://ell.stackexchange.com/questions/58233/a-million-dollars-is-still-needed-or-are-still-needed
重點節錄如下
That's a good question.
Perhaps someone else can give a more grammatically based answer, but let me respond from the position of how those sound to a native speaker.
Those both sound fine to my ear. For comparison, let's remove a few words from the sentence in two different ways:
One is still needed to reach our goal.
Dollars are still needed to reach our goal.
In both those examples it's clear which verb to use, but talking about "one million dollars" is sort of both singular and plural, so you'll hear both. "A million dollars" can be viewed as a unit, but each dollar is also a thing, and there are many of them.
Even though those both sound fine, I too am not entirely sure which
is correct, and I might doubt myself if I used either one in a formal setting. To sidestep this issue, I would phrase the statement like so:
We still need a million dollars to reach our goal.
If I had to choose one of the two phrasings, I would pick the singular, with 'is'. This is because I view "a million dollars" more as a unit or quantity than as a collection of individual dollars.
The quantity of a million dollars is still needed to reach our goal.
'Is' matches quantity.
From 紐約時報
more than a million dollars was spent – 9筆
more than a million dollars was spent – 1筆 – 我沒付費不能copy
1. Britons who argue that the monarchy has outlived its usefulness will almost certainly continue to draw attention to the cost of the royal ceremony to the public during a time of sweeping budget cuts, just as opponents of Sweden’s monarchy did in June, when more than a million dollars was spent on the marriage of Crown Princess Victoria to her personal trainer.
2. In 1987, before the election year even began, more than $87 million dollars was spent on the current Presidential campaign. By the end of January that number grew to more than $101 million. On March 8, ''Super Tuesday'' - with 20 states conducting primary elections and caucuses, estimates are that the candidates added as much another $10.7 million to the total.
Google Search (Google Search)
more than a million dollars was spent – 18,400 筆
列舉一筆如下
2017年2月11日 - More than a million dollars was spent in seven individual races. Executive Director Craig Mauger says all the money spent in 2016 didn't ...
more than a million dollars were spent --只有十筆
The Deschutes River basin provides a good example, where more than a million dollars were spent on road, fish passage, instream, and other types of restoration between 1995 and 2001 (Figure 5). Evaluating the effects of these individual ...

A dollar is the unit of currency in several countries, the USA, AUSTRALIA; TW.... What is the exchange rate between the US$ and the NTWD ?
A plural is the form of a noun, pronoun, determiner, adjective or verb used to refer to more than one thing (dollar)The verb is in the plural(=dollars were).
A plural word is a word in or having this form.
Plural means consisting of more than one thing or consisting of different kinds of things:-eg:-million dollars.Some nouns have no plural forms (money);"More than +singular" are to be treated as singular.We often use "a piece" and "some pieces" to count them so as to remain to have no plural forms.Some nouns are always plural:-(riches, savings;but not money)
This noun (million-dollars) can be followed by a singular or plural verb.

More than a million dollars were spent on advertising. (超過一百萬元都被花費了在廣告上。)
# more than ....：釋義1. ((伴隨數詞等))…以上(的)，超過 .... 例. More than one man is against him. (反對他的不僅1人。)（◆「more than+單數名詞」通例以單數處理）。
# were：釋義1. ((be 的直説法複數及第二人稱單數(are)的過去形))。
◆在((會話))，除了"If I were you, …." 一樣的固定的表現，were 的替代－直接說法過去的 was 被喜好。