It ______ yesterday. The ground is still wet now.

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问题 It ______ yesterday. The ground is still wet now.

选项 A、must have rained
B、was raining
C、rained
D、had rained

答案A

解析 must+have+动词-ed形式,表示对过去情况的一种肯定的推测。句意:昨天一定下雨了。地面现在还是湿的。
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