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来源 :焚题库 2020-07-28

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单项选择题 Since the road is wet this morning,（）last night.

A.it must rain

B.it must be raining

C.it must have rained

D.it must have been rain

正确答案：C

答案解析:对过去发生的事作肯定的判断时，用must have done。

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