◎ 题干
Having checked the doors were closed, and _____ all the lights were off, the boy opened the door to his bedroom.

A. why
B. that
C. when
D. where
◎ 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“Having checked the doors were closed, and _____ all the lights were off, the boy opened the door to his bedroom. [ ]A. why B. thatC. when D. where …”主要考查了你对  【从属连词】【宾语从句】  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。