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题目内容
（兰州大学-大学英语3）
(4分)Since the road is wet this morning，last night ___.
A. it must be raining
B. it must rain
C. it must have rained
D. it must have been rained
A. it must be raining
B. it must rain
C. it must have rained
D. it must have been rained
参考答案
