单选题：In the experiment we kept a watchful eye __________ the deve

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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：

不良品德如何矫正？

不良品德如何矫正？

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What is the new cause of the evangelicals?A．Fighting against abortion. B．Warning

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本文关于清风、明月、江水的景物描写有何作用?

本文关于清风、明月、江水的景物描写有何作用?

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