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
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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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
both 表示的是两者都，根据上文的意思，选D，符合题意。