成人英语三级

单选题 Since this road is wet and slippery this morning,it __________ last night．

A．must rain
B．was raining
C．must have rained
D．may rain

参考答案：C进入在线模考
【参考译文】今天早晨路上又湿又滑，昨晚肯定下雨了。
【答案解析】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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