◎ 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n多题专家分析,试题“Helen has two sisters and a brother. Her brother is working, but _____ her sisters are still at school. [ ]A. neitherB. eitherC. all D. 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。