The road is wet. It ______ last night.

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问题 The road is wet. It ______ last night.

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

答案B

解析 must与动词的完成时态连用,表示对过去的情况进行肯定的猜测。如表示否定猜测,则用can’t+动词的完成形式。
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