The students were singing an English song _______ Mr.Xiang came in the classroom.A.after B.when
为什么
人气：389 ℃ 时间：2019-11-10 18:46:33
解答
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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