— When did the bell ring for the fire alarm? — At 9 a.m. this morning, when we _________ morning exe...
2022-09-02 02:14:36 57次 江苏省南京市玄武区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：
— When did the bell ring for the fire alarm?
— At 9 a.m. this morning, when we _________ morning exercises in the playground.
A.do B.are doing C.did D.were doing
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