Children need friends their own age to play with. A. ofB. forC. inD. at

问题补充：

Children need friends their own age to play with.

A. of

B. for

C. in

D. at

答案：

(答案→)A. of

B. for

C. in

D. at

解析：考查名词双重所有格。friends of their own age意思是“他们自己年龄的朋友”，选A符合，其他选项不能构成所有关系。