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(dòng)詞的時(shí)態(tài)。句意：如果我們現(xiàn)在不行動(dòng)起來保護(hù)環(huán)境，我們會(huì)后悔的�？疾橹鲗默F(xiàn)，故選C項(xiàng)。

考點(diǎn)：考查動(dòng)詞的時(shí)態(tài)

 

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