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

答案C

解析 本题考察动词时态的用法。题干中提到“The road is wet this morning”表示与现在相关,所以后面的动词应用完成时态,选项中的助动词“must”表示猜测,且其后动词用原形。
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