问题
选择题
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
答案
答案：D
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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
答案：D