【題目】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】句意老師正向?qū)W生們解釋這個(gè)實(shí)驗(yàn),下課鈴聲響了。”until直到;before……之前;while表示當(dāng)……時(shí)候,after在……之后。此處表示當(dāng)老師正講解實(shí)驗(yàn)時(shí),鈴聲響了,故用連詞while,故選C。

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