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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