问题补充:
---Are Jim and Bob playing outside?
----.They are doing their homework in the study.
A. Either
B. Both
C. Neither
D. None
答案:
A. Either
B. Both
(答案→)C. Neither
D. None
解析:either任何一个;both两者都;None表示三个及三个以上都没有,指人; Neither表示两者都不。句意:吉姆和鲍勃在外边玩吗?——他们都没有。他们正在书房做他们的作业。故选C。
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