It______last night, because the ground is wet.

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问题 It______last night, because the ground is wet.

选项 A、rain
B、must rain
C、must have rained
D、rained

答案C

解析本题考查情态动词。根据句意可知这是对过去事情的肯定推测，应该用must have done，故选C。

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大学英语三级B级

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