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单选题
The road was muddy. It _____ last night.
A
must rained
B
must have rained
C
must be rained
D
could have rained
参考答案
参考解析
解析：
句意：路很泥泞，昨晚肯定下过雨了。must have done表示对过去的肯定推测，故为B。
句意：路很泥泞，昨晚肯定下过雨了。must have done表示对过去的肯定推测，故为B。
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