【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生們解釋這個問題時,鈴響了。A. after……之后;B. while當(dāng)……的時候;C. before……之前。只有while能與進(jìn)行時態(tài)連用。故答案為B。

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