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A.did not happen
B.hadn't happened
C.haven't happened
D.would not happened

A.did
B.hadn't
C.haven't
D.would

【参考答案】

B
解析:hadn'thappened,注意此处的过去虚拟语气:要是眼前这一切不曾发生,让他们做什么他们都愿意。
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