✔ 最佳答案
During the past two decades, temperatures in northern Great Barrier Reef have increased to the point that virtually no male turtles are produced, __43__ raises new concerns over the immediate threats of climate change to the population’s future.
(A) while – 通常用於兩個連續進行的動作,例如I’m recording a video while my husband is working. 其用法與when 已很像,但後者用於一先一後之同時或短暫時間之同時,如
I picked up (後) the phone when it rang(先) – 但幾乎是同時
When I get home(先), I take off(後) my shoes – 但幾乎是同時
故while不合句意
(B) whatever – 不管怎樣 – 意思已不合
例句:We’ll go whatever the weather
(C) whether – 是否– 意思已不合
例句:I wonder whether it will rain tomorrow.
(D) which : which –用於描述事物,在本句which所指為之前之整段:在過去的20年,北大堡礁的氣溫已上升到使公海龜無法孵出。
Which (這件事情) 使氣候變遷對物種的立即威脅增加了新的顧慮.
故需用which