问题描述：
英语选择题 _____ of the students is playing on the playground.
_____ of the students is playing on the playground.
A.None B.All C.Both D.No one
请问,这道题为什么选A,为什么不选D?谢谢!
_____ of the students is playing on the playground.
A.None B.All C.Both D.No one
请问,这道题为什么选A,为什么不选D?谢谢!
问题解答：
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