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
此處if引導一個真實條件句。在真實條件句中，謂語動詞涉及到將來動作時，要用一般現(xiàn)在時代替一般將來時，所以用一般現(xiàn)在時，故C正確。句意：如果我們現(xiàn)在不采取行動保護環(huán)境，我們會遺憾一輩子。
【考點定位】本題考查動詞時態(tài)。
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