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    【题目】—With the failure of the experiment, we reach a dead end.

    —Cheer up! Many good things would never have happened if the bad events ________ first.

    A. don’t happen B. didn’t happen

    C. hadn’t happened D. haven’t happened

    【答案】C

    【解析】表示与过去事实相反的推测时，主句用would have done的形式，if从句用过去完成时。

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