He was about to go to bed ________ the doorbell rang. A.while B.as C.before D.when
2022-08-02 08:29:02 176次 黑龙江省2019-2020学年高一上学期期末英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
He was about to go to bed ________ the doorbell rang.
A.while B.as C.before D.when
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