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  3. Since the road is wet this morning, ______ last night.

Since the road is wet this morning, ______ last night.

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问题 Since the road is wet this morning, ______ last night.
选项 A、it must rain
B、it must be raining
C、it must have rained
D、it must have been rain
答案C
解析 对过去发生的事作肯定的判断时，用must have done。
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