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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
考查時態(tài)。根據(jù)if主句的一般將來時態(tài)可知從句應使用一般現(xiàn)在時態(tài)，且有now作為現(xiàn)在時態(tài)的標志詞，故選C。
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