◎ 题干
-Does your sister play the piano every day?
-Sometimes she _____ and sometimes she _____.            

A. don't; do          
B. does; doesn't      
C. is; isn't
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“-Does your sister play the piano everyday?-Sometimes she _____ and sometimes she _____.[ ]A. don't; do B. does; doesn't C. is; isn't…”主要考查了你对  【助动词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。