The students were singing an English song _______ Mr.Xiang came in the classroom.A.after B.when为什么
问题描述：
The students were singing an English song _______ Mr.Xiang came in the classroom.A.after B.when
为什么
答
B when was/were doing_____did
答
B when
The students were singing an English song when Mr. Xiang came in the classroom
Mr. Xiang 进来的时候，学生们正在唱歌
when 引导时间状语从句
答
B
当一个动作发生时另一个动词正在进行.
翻译：当MR XIANG走进教室时学生们正在唱英语歌.
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