【題目】If you leave the water running ________ you are brushing your teeth, you might waste a lot of water.

A.butB.whileC.duringD.and

【答案】B

【解析】

句意:如果你刷牙時一直讓水流淌著,你可能會浪費掉很多水。

本題考查連詞。but但是,while……時候,during……期間,是介詞;and而且,根據(jù)you are brushing your teeth此處表示當你正在刷牙時,與現(xiàn)在進行時連用,用while引導時間狀語從句。故選B。

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