---What are you busy with ?--- We are carrying out a research the causes of cancer.A. in

发布时间：2020-08-16 12:52:10

      ---What are you busy with ?
--- We are carrying out a research      the causes of cancer.
A. into
B. onto
C. to
D. in

网友回答

(答案→)A. into
B. onto
C. to
D. in
解析：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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