题目内容
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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