If we now to protect the environment, we will live to regret it. A. hadn't acted B. haven't acted C. won't act D. don't act 题目和参考答案——青夏教育精英家教网—

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If we ____ now to protect the environment, we will live to regret it.

A. hadn't acted B. haven't acted C. won't act D. don't act

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