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

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

C 【解析】句意“老師正向?qū)W生們解釋這個實驗，下課鈴聲響了。”until直到；before在……之前；while表示當……時候，after在……之后。此處表示當老師正講解實驗時，鈴聲響了，故用連詞while，故選C。
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