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`one为什么b c d是错的?

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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`one
为什么b c d是错的?

a和d有差吗?

因为a对