—— What can I do for you? ——I’d like to buy a gift for my mother’s birthday one at prop

问题补充：

—— What can I do for you?

——I’d like to buy a gift for my mother’s birthday, one at proper price but of use and it’d better be surprise.

A. the; /; a

B. the; a ; /

C. a; the; /

D. a; / ; a

答案：

A. the; /; a

B. the; a ; /

C. a; the; /

(答案→)D. a; / ; a

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