This is to answer your letter of _______ on the Police Force's policies and pr ocedures concerning undercover detectives . a. require b. inquire c. inquiry d. request 题目是要选名词,所以ab选项可删除,但cd选项我觉得都可以耶,大家认为正解为何? 网络上找到的多益练习题,答案给d,但那篇其他题有出现错误解答,所以想向版友们求 解,谢谢囉