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【题目】Please turn off the shower while ______ your hair.

A. washed B. washing C. are washing D. wash

【答案】B

【解析】

句意:洗头时请关掉淋浴。考查动词形式辨析题。在while从句中,当主句与从句主语相同,且从句谓语动词含有动词be时,通常可省略从句主语和动词be。本句主句是祈使句,主语和从句主语相同;完整的从句是while you are washing your hair.。根据句意结构,可知选B。

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