单选题 The crime rate has continued to rise in American cities despite efforts on the part of both government and private citizens to curb ______.
A. them B. its C. him D. it

【正确答案】 D
【答案解析】本题考核的是crub(控制，抑制)的宾语，通读全句，很明显在这里要控制的是用it代指的“犯罪率”，因此其他三个选项都不适合。