单选题
Since the road is wet this morning, ______ last night.
A、
it must rain
B、
it must be raining
C、
it must have rained
D、
it must have been rain
【正确答案】
C
【答案解析】
对过去发生的事作肯定的判断时用must have done。今天早晨路面是湿的，可见昨天夜里一定下雨了。
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