Ms. Ravi has already conducted market research ______two new products.

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问题 Ms. Ravi has already conducted market research ______two new products.

选项 A、around
B、from
C、on
D、near

答案C

解析 On is the preposition used with conduct research. Choice (A) means concerning. Choice (B) indicates source or origin. Choice (D) means close to.  
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