Having checked the doors were closed, and _______ all the lights were off, the boy opened the door t...
2022-12-09 08:04:15 144次 2014届黑龙江哈九中高二下期期末考试英语卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
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
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