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    精英家教网 > 高中英语 > 题目详情
    In the experiment the scientist kept a watchful eye________the developments and recorded every detail.
    A．inB．at C．forD．on
    D  
          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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