The policeman is helping the old woman a heavy bag on her back.A. inB. withC. atD. on

问题补充：

The policeman is helping the old woman a heavy bag on her back.

A. in

B. with

C. at

D. on

答案：

A. in

(答案→)B. with

C. at

D. on

解析：此题重点考查对语句的整体理解。根据语境可知这个警察正在帮助一个背着沉重包裹的老太太。其中介词with表示和…在一起的意思，其他介词没有词义，故选B。