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【题目】Someone ____the tap on, for the water was running over and flooding the bathroom.

A. could leave

B. must have left

C. might leave

D. should have left

【答案】B

【解析】

考查情态动词+完成式。句意:一定是有人没关水龙头,因为水溢出来淹了浴室。must have done表示对过去是清有把握的坑定推测,意思是一定是做某事了,故选B。

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