Having checked the doors were closed, and all the lights were off, the boy opened the door to his be...
2022-08-27 10:05:35 84次 黑龙江省2018-2019学年高二下学期开学考试英语试卷 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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