【題目】—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】表示與過去事實(shí)相反的推測(cè)時(shí)，主句用would have done的形式，if從句用過去完成時(shí)。

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