—What can I do for you?—I’d like to buy a present for my son at a proper price but of gre

问题补充：

—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. that

B. the one

C. which

D. one

答案：

A. that

B. the one

C. which

(答案→)D. one

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