A policeman knocked at the door ________ we were having dinner yesterday. A.while B.until C.before D...
2022-09-07 09:14:36 35次 天津市部分区（蓟州区）2019-2020学年八年级上学期期末英语试卷 单选题 反馈错误 加入收藏 正确率 : 100%
题目内容：
A policeman knocked at the door ________ we were having dinner yesterday.
A.while B.until C.before D.because
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