问题
单项选择题
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
答案
参考答案：A
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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
参考答案：A