since this road is wet and slippery this morning,it----last night.

since this road is wet and slippery this morning,it----last night.

题目
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
答案
C
情态动词肯定推测句
因为这条路很湿,昨晚一定下雨了
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