Scholars are used to keep an eye________the progress of science in the world.A、f

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问题 Scholars are used to keep an eye________the progress of science in the world.

选项 A、for
B、on
C、in
D、at

答案 B

解析 keep an eye on为固定短语，意为“密切关注，留意”，其余三项均不能与keep an eye搭配。

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