单选题：In the experiment we kept a watchful eye （　　）the development

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  • 题目类型：单选题
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题目内容：
In the experiment we kept a watchful eye （　　）the developments and recorded every detail. A．in
B．at
C．for
D．on

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答案解析：

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分类：公共英语三级  题型：单选题
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