Turn off the water while you your teeth or washing your hands．( )A．were brushingB．brushC．are brushingD．brushed 题目和参考答案——青夏教育精英家教网—

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14．Turn off the water while you ________ your teeth or washing your hands．（　　）

A．

were brushing

B．

brush

C．

are brushing

D．

brushed

分析当你刷牙或洗手时，请关上水．

解答答案：C while引导的时间状语从句中的动词为延续性动词，故用进行时态；根据主句Turn off the water用一般现在时态可知，从句用现在进行时态，故选C．

点评主从复合句要注意主句和从句时态的习惯用法．

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