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    精英家教网 > 高中英语 > 题目详情
          ---What are you busy with ?
    --- We are carrying out a research ____ the causes of cancer.
    A．intoB．ontoC．toD．in
    A
    考查介词：do/carry out research into/on对…做研究，句意：--你在忙什么？--我们在做一个关于癌症原因的研究。选A。
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