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题目内容
（河南科技大学大学英语3(专升本)）
Since the road is wet this morning, ______ last night.
选项:
A:it must have rained
B:it must rain
C:it must be raining
D:it must have been rained
选项:
A:it must have rained
B:it must rain
C:it must be raining
D:it must have been rained
参考答案