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【题目】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:如果你刷牙时一直让水流淌着,你可能会浪费掉很多水。

本题考查连词。but但是,while……时候,during……期间,是介词;and而且,根据you are brushing your teeth此处表示当你正在刷牙时,与现在进行时连用,用while引导时间状语从句。故选B

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