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  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 keep an eye on是固定搭配，意为“留意，注视”，在本句中表示“仔细观察”。故选D。
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