Question

—Can I help you?
—I’d like to buy a present for my father’s birthday,       at a proper price,but of good use

1. A.
   that
2. B.
   one
3. C.
   it
4. D.
   which

Answer 1

B
考查代词：A.that特指前面的可数名词单数或是不可数名词， B.one泛指前面的可数名词单数， C.it特指前面的同类同物， D.which引导定语从句，句意是：--要我帮忙吗？--我想为父亲的生日买个礼物，一个价格合理但很有用的礼物。选B。