the streets are all wet.It_____during the night.The streets are all wet.It_____during the night.A.must be rainingB.must have rainedC.must have been rainedD.had to rain
问题描述：
the streets are all wet.It_____during the night.
The streets are all wet.It_____during the night.
A.must be raining
B.must have rained
C.must have been rained
D.had to rain
答
B.must have rained
答
B
表示对过去的肯定的推测,用现在完成时