Everything comes with price; there is no such thing as a free lunch in the world.A. a; a

问题补充：

Everything comes with price; there is no such thing as a free lunch in the world.

A. a; a

B. the; /

C. the; a

D. a; /

答案：

A. a; a

B. the; /

C. the; a

(答案→)D. a; /

解析：price意为“代价；价格”，为可数名词，见面要加冠词; no such后面不用冠词，故选D项。