问题描述：
---Can I help you?
---I’d like to buy a present for my father’s birthday,______ at a proper price but of great use.
为什么是one不是which?说明理由,
---I’d like to buy a present for my father’s birthday,______ at a proper price but of great use.
为什么是one不是which?说明理由,
问题解答：
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