题目内容
28. In the experiment we kept a watchful eye ________ the developments and recorded every detail.
A. in B. at
C. for D. on
D
解析:
因为keep an eye on…是习语,意为“密切注视…”。

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题目内容
28. In the experiment we kept a watchful eye ________ the developments and recorded every detail.
A. in B. at
C. for D. on
D
因为keep an eye on…是习语,意为“密切注视…”。
|