Mr.Smithcouldn’topenthedoorbecausehisnaughtyboy

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问题详情:

Mr.Smithcouldn’topenthedoorbecausehisnaughtyboy

Mr. Smith couldn’t open the door because his naughty boy _______ it from the inside

A. would lock     B. was locking       C. has locked  D. had locked

【回答】

D

知识点:过去完成时及其被动式

题型:选择题

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