题目内容

Who always _______ mother do her housework? Your sister ______.

A. help; is B. helps; does C. helps; is D. help; does

B 【解析】句意:谁经常帮妈妈做家务?你妹妹做。根据主语Who看做是单数,谓语动词用单数形式;根据. helps是实意动词,所以用does代替;故选B
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