In the experiment we kept a watchful eye ________ the developments and recorded every detail. A.inB

题目简介

In the experiment we kept a watchful eye ________ the developments and recorded every detail. A.inB

题目详情

In the experiment we kept a watchful eye ________ the developments and recorded every detail.
A.inB.at C.forD.on
题型:单选题难度:偏易来源:不详

答案

D
因为keep an eye on…是习语,意为“密切注视…”。

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