In the experiment we kept a watchful eye ______ the developments and recorded ev

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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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