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they never sleep but sometimes they rest（）a short time.a.in b.for c.at

分类: 作业答案 • 2021-12-20 12:56:24

问题描述：

they never sleep but sometimes they rest（）a short time.a.in b.for c.at

答

B A、C指在一个时间段,只有B为一段时间!