請問句首空格部分要填哪個選項？______amazes Ms.Smith is the speed of her new computer.(A)That(B) Which(C)Who(D) What?

這裡要用「帶先行詞的關係代名詞」what
what = the thing that ....
What amazes Ms Smith is the speed of her new computer.
what是附屬子句（當作主要子句主詞的「名詞子句」）的主詞，同時在邏輯上，也是主要子句的主詞。
上句也可寫成下面的方式：
The thing that amazes Ms Smith is the speed of her new computer.
這樣寫的話that（關係代名詞）帶出來的是一個當作修飾語的「形容詞子句」。它的先行詞是thing

that/which在當關係代名詞用時，前面需要有「先行詞」

Who is not for us is against us.
Whoever comes will be welcome.
who/whoever也可當作「帶先行詞的關係代名詞」用
who = the person who

when = the time when
where = the place where
why = the reason why
關係副詞也可以帶出名詞子句當作主要子句的主詞或受詞。
Go where you like.
That's where we used to play.
Monday is when I am busy.
I know why he's worried.
How I spend my free time is a private matter.

正解: (D) What
整句翻譯: 令史密斯女士驚訝的是她的新電腦的速度。

Which selection should be filled in in the first space section?(D) as answer= meaning a predeterminer pronoun.use in a statement.說起来,表示多麽驚奇,什麼=What.---Okay, give me 20 marks for the challenging response, please, as "prisoners" has said.