If we _______ now to protect the environment, we'll live to regret it.

A. hadn't acted B. haven't acted

C. don't act D. won't act

 

C

【解析】

試題分析：考查動詞的時態(tài)。句意：如果我們現(xiàn)在不行動起來保護環(huán)境，我們會后悔的。考查主將從現(xiàn)，故選C項。

考點：考查動詞的時態(tài)

 

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