题目内容
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
C
解析:
must have done用于对过去发生的事情进行推测,且较有把握。
解析:
must have done用于对过去发生的事情进行推测,且较有把握。
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