语法与词汇 It turned out that the man was an excellent policeman working in New York,_____ had contributed a lot to the case.
【正确答案】 C
【答案解析】此题考查的是非限定性定语从句,表示对前面句子的补充说明。Who指代前面的policeman,这句话的意思为;原来那人是在纽约工作的优秀警察,他为这个案子贡献很多。