[問題]賴水信高分托福文法 P325 Q109

[Janiceyen]

Only in recent years have people become aware of the importance of environmental protection and ________ various measures to prevent pollution from becoming progressively worse.
(A)began to take
(B)they begin to take
(C)begun to take
(D)do they begin to take
標準答案為C。動詞不是為become aware of 為現在式嗎？
考的是平行結構的問題，我選擇A，但我看不知道為啥要選擇C呢。請高手幫忙巴。

[Lucy Tsai]

Only in recent years have people become aware of the importance of environmental protection and ________ various measures to prevent pollution from becoming progressively worse.

要注意紅色和綠色的字喔
最近幾年,人們已經變得清楚環境保護的重要並且開始各種測定以防止日益嚴重的汙染
希望我有回答到你的問題

[Supergirl]

這一題的動詞應該是 have become
所以become 並不是現在式而是過去分詞
become-became-become
begin-began-begun
:)

[Janiceyen]

謝謝 Lucy和supergirl的回答，超清楚的。完全瞭解了。因為一堆字把我都看傻了，尤其是連做同一章節裡的問題都還狂錯的我。謝謝～！！謝謝～！！