单选题
Ms. Ravi has already conducted market research ______two new products.
A、
(A) around
B、
(B) from
C、
(C) on
D、
(D) near
【正确答案】
C
【答案解析】
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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