◎ 题干
______,the boy couldn’t enter his house.
A.Since the key had lost    B.The key being lost
C.Lost the key    D.Having lost the key
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“______,the boy couldn’t enter his house.A.Since the key had lostB.The key being lostC.Lost the keyD.Having lost the key…”主要考查了你对  【独立主格结构】  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。