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 考查固定搭配。keep an eye on意为“密切注意”，是一个固定搭配，因此选项D为正确答案。
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专业英语四级

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