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【题目】The bell rang _________ the teacher was explaining the experiment to the students.

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

【答案】C

【解析】句意老师正向学生们解释这个实验,下课铃声响了。”until直到;before……之前;while表示当……时候after在……之后。此处表示当老师正讲解实验时,铃声响了,故用连词while,故选C。

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