---What are you busy with ?
--- We are carrying out a research ____ the causes of cancer.
A．intoB．ontoC．toD．in
A
考查介詞：do/carry out research into/on對…做研究，句意：--你在忙什么？--我們在做一個關(guān)于癌癥原因的研究。選A。
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