Jingdezhen is most beautiful city with long history of porcelain-making in the world..A.

问题补充：

Jingdezhen is most beautiful city with long history of porcelain-making in the world..

A. the, the

B. a, a

C. a, the

D. the, most

答案：

A. the, the

(答案→)B. a, a

C. a, the

D. the, most

解析：句意：景德镇是一个美丽的城市，在世界上，有着很长的制瓷业历史。most当副词还有十分,很的意思,a most beautiful city的most就是取了十分这个意思；第二个空也是泛指，选B。