The ground is wet. It ______have rained last night.

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问题 The ground is wet. It ______have rained last night.

选项 A、must
B、can
C、should

答案A

解析 本题考查情态动词的用法。所以答案为A。而should表示猜测时一般用在否定句和疑问句中。
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