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

A. until B.before C.while D.after

【答案】C

【解析】

试题分析:句意:正当老师向学生解释答案时,铃声响了。A. until直到;B. before 在…之前; C. while 正当;D. after在……之后。只有C. while 能与进行时态连用。故答案为C。

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