I’d like to buy a present for my father’s birthday at a proper price but of great use.A.

问题补充：

I’d like to buy a present for my father’s birthday, at a proper price but of great use.

A. one

B. it

C. that

D. this

答案：

(答案→)A. one

B. it

C. that

D. this

解析：考查代词。句中one指代同类但非同一个，本题指代a present，根据句意选A。