问题补充:
--What can I do for you?
-- I’d like to buy a present for my son, at a proper price but of great use.
A. one
B. the one
C. which
D. that
答案:
(答案→)A. one
B. the one
C. which
D. that
解析:考查代词:分析句子结构:后半句 “at a proper price but of great use” 没有动词,不是一个完整的句子,所以不选连接词which 和 it,而one可以做代词,指代a present,the one有特指的意思,这里还没有选好礼物,不用特指。选C。