2. 外语
  3. In the experiment we kept a watchful eye ______ the developments and recorded every detail.

In the experiment we kept a watchful eye ______ the developments and recorded every detail.

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问题 In the experiment we kept a watchful eye ______ the developments and recorded every detail.
选项 A、in
B、at
C、for
D、on
答案D
解析 解好本题的关键在于掌握好动词keep与名词eye和介词on的固定搭配，在理解句意的同时就应该注意到“keep a watchful eye”，这样在选择时就不会走弯路。句意：实验中我们密切注视实验的进展并记录下每个细节。
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