Having checked the doors were closed, and all the lights were off, the boy opened the door to his b...
2023-02-14 00:25:44 176次 安徽省2010届高三第三次质检 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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