In the experiment the scientist kept a watchful eye________the developments and

In the experiment the scientist kept a watchful eye________the developments and

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In the experiment the scientist kept a watchful eye________the developments and recorded every detail.
A.inB.at C.forD.on

答案
D  
解析
      题意:在试验中科学家密切注视着试验的进展并且记录着每个细节。keep an eye on…是习语,意为“密切注视…”。
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