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

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”，为可数名词，第二空前有no，后面的名词不用冠词，故选D项。