◎ 题干
Helen has two sisters and a brother.Her brother is working, but  _____ her sisters are still at school,
[     ]
A. neither            
B. either
C. all                
D. both
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Helen has two sisters and a brother.Her brother is working, but_____ her sisters are still at school,[ ]A. neither B. eitherC. allD. both…”主要考查了你对  【不定代词】  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。