The students were singing an English song _______ Mr. Xiang came in the classroom. A.after B.when
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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
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
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B when was/were doing_____did
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