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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：句意：如果我們現在不行動起來保護環(huán)境，我們會后悔的。主句是一般將來時，if條件句不能用一般將來時，用一般現在時代替一般將來時，選C。

考點：考查時態(tài)

 

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