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Turn off the water while you ________ your teeth or washing your hands.
A.were brushingB.brush
C.are brushingD.brushed
C

试题分析:句意:当你刷牙或者洗手时关掉水管。while引导的从句中常用进行时态。当主句描述将来动作时,条件从句中常用现在时态,故选C。
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