问题补充:
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:
A. neither
B. either
C. all
(答案→)D. both
解析:both 表示的是两者都,根据上文的意思,选D,符合题意。
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