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【题目】The bell rang ______ the teacher was explaining the problem to the students..

A. after B. while C. before

【答案】B

【解析】

试题分析:句意:正当老师向学生们解释这个问题时,铃响了。A. after……之后;B. while……的时候;C. before……之前。只有while能与进行时态连用。故答案为B。

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