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【題目】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】

考查情態(tài)動詞+完成式。句意：一定是有人沒關水龍頭，因為水溢出來淹了浴室。must have done表示對過去是清有把握的坑定推測，意思是“一定是做某事了”，故選B。

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