Since the road is wet,（） last night.<br>A:it must have rained<br>B:it must rain<br>C:it must be raining<br>D:it must have been raining

Since the road is wet,（） last night.
A:it   must   have rained
B:it   must   rain
C:it   must   be    raining
D:it   must   have   been raining

出自：专升本

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