Since this road is wet and slippery this morning, it______last night.A、must rain

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问题 Since this road is wet and slippery this morning, it______last night.

选项 A、must rain
B、was raining
C、must have rained
D、may rain

答案 C

解析本题考查情态动词+完成时的用法，表示对已经发生的事情作肯定的猜测，如：I didn’t hear the phone．I must have been asleep(我没有听见电话铃响，我肯定睡着了)。

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