—Can I help you?—I’d like to buy a present for my father’s birthday, at a proper price,but of good useA.thatB.oneC.itD.which
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B解析考查代词: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。