In the experiment we kept a watchful eye______the developments and recorded ever

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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

解析本题考查固定搭配。本句句意为“在这个实验中，我们密切注视着事态的发展，记录了每个细节”。keep an eye on是一个固定搭配，意思为“注意，留意；照看”。所以答案为D)。

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