The students were singing an English song _______ Mr. Xiang came into the classroom. A. after B. whe...
2022-12-15 14:50:25 18次 2014-2015学年湖北咸宁嘉鱼城北中学八年级上第三次月考英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
The students were singing an English song _______ Mr. Xiang came into the classroom.
A. after B. when C. before D. as
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