Since this road is wet and slippery this morning, it _____ last night.
A. must rain
B. was raining
C. must have rained
D. may rain
A. must rain
B. was raining
C. must have rained
D. may rain
【答案】
A. must rain
B. was raining
C. must have rained
D. may rain
A. must rain
B. was raining
C. must have rained
D. may rain
【答案】
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