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Birds can see better if they focus only one eye at a time ___something.A.in B.at C.for D.on

分类: 作业答案 • 2022-01-09 18:05:27

问题描述：

Birds can see better if they focus only one eye at a time ___something.A.in B.at C.for D.on

答

on
focus on 集中于