In the experiment the scientist kept a watchful eyethe developments and recorded every det

发布时间：2020-08-15 00:11:48

In the experiment the scientist kept a watchful eye    the developments and recorded every detail.
A. in
B. at
C. for
D. on

网友回答

A. in
B. at
C. for
D. on
解析：      题意：在试验中科学家密切注视着试验的进展并且记录着每个细节。keep an eye on…是习语，意为“密切注视…”。
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