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

问题补充：

Everything comes with price; there is no such thing as 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：考察冠词，题意，每件东西都有一个价格；世界上没有像免费的午餐一样的东西。前文价格泛指任何一个价格，当such前面有no时，必须省去不定冠词a(an)，因为no such本身已经包括了不定冠词，相当于not such a(an)故不用冠词，选D。