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

A. after B. while C. before

【答案】B

【解析】

試題分析：句意：正當(dāng)老師向?qū)W生們解釋這個(gè)問(wèn)題時(shí)，鈴響了。A. after在……之后；B. while當(dāng)……的時(shí)候；C. before在……之前。只有while能與進(jìn)行時(shí)態(tài)連用。故答案為B。

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