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They ()very busy.a:both.b:all are.c:are both.d:are all.

分类: 作业答案 • 2021-12-28 17:40:34

问题描述：

They ()very busy.a:both.b:all are.c:are both.d:are all.

答

c和d都可以选啊,肯定有前文吧?
are both表示俩个都
are all表示（三者或以上）都