In the experiment the scientist kept a watchful eye________the developments and recorded every detail.
A．inB．a(chǎn)t C．forD．on
D  
      題意：在試驗(yàn)中科學(xué)家密切注視著試驗(yàn)的進(jìn)展并且記錄著每個(gè)細(xì)節(jié)。keep an eye on…是習(xí)語(yǔ)，意為“密切注視…”。
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