【单选题】

Since the road is wet this morning, ______ last night.
A．it must rain

B．it must be raining
C．it must have rained
D．it must have been rain

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根据网考网移动考试中心的统计，该试题：

17%的考友选择了A选项

19%的考友选择了B选项

63%的考友选择了C选项

1%的考友选择了D选项

Since the road is wet this morning, ______ last night.A．it must rain