摘要：1296] He has done some research free markets in this city for . [译文] 他在这个城市作了一段时间的关于自由市场的调查. A. on; sometime B. of; sometimes C. about; some time D. in; soe times [答案及简析] C. do some research about sth. 作关于-的调查,some time表示一段时间.

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