◎ 题干
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
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Mr. Smith couldn’t open the door because his naughty boy ______ it from the inside.A.would lock B.was lockingC.has lockedD.had locked…”主要考查了你对  【过去完成时】【过去完成时的被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。