It is not easy to describe a policeman’s job. After all, a policeman has a number of jobs in .
A. it
B. one
C. his
D. that
网友回答
A. it
(答案→)B. one
C. his
D. that
解析：考查代词：用it的话是直接指代policeman，而用one是用来强调policeman作为一份工作，相当于one job。句意：很难描述警察的工作，毕竟一个警察一份工作里面有很多事。选B。