In the experiment you should keep a watchful eye the developments and record every detail

发布时间：2020-08-17 11:48:52


In the experiment you should keep a watchful eye      the developments and record every detail.
A. in
B. at
C. for
D. on

网友回答

A. in
B. at
C. for
(答案→)D. on
解析：keep an eye on sth 注意，监视
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