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China's present environment situation is from bad to worse and if we _________ now to protect the environment, we’ll live to regret it.
A．hadn’t actedB．haven’t actedC．don’t actD．won’t act
C

試題分析：句意：中國目前的環(huán)境狀況越來越糟糕，如果我們現(xiàn)在不采取行動來保護環(huán)境，我們將會后悔。if引導(dǎo)的條件狀語從句，主句為一般將來時態(tài)，if從句用一般現(xiàn)在時態(tài)，選C。
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