问题
选择题
--Can I help you?
--I'd like to buy a present for my father's birthday, ___________ at a proper
price but of great use.
A．one
B．anyone
C．that
D．everything
答案
答案：A
本题是对代词的考查。题中one替代前面提到的a present，that通常替代前面一个已知的事物。