问题
选择题
The streets are all wet.It ___ during the night.
A．must be raining
B．must have been rain
C．had to rain
D．must have rained
答案
答案：D
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The streets are all wet.It ___ during the night.
A．must be raining
B．must have been rain
C．had to rain
D．must have rained
答案：D