题目内容

      ---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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