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(xiàn)在不行動(dòng)起來(lái)保護(hù)環(huán)境，我們會(huì)后悔的。主句是一般將來(lái)時(shí)，if條件句不能用一般將來(lái)時(shí)，用一般現(xiàn)在時(shí)代替一般將來(lái)時(shí)，選C。

考點(diǎn)：考查時(shí)態(tài)

 

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