The tall building in the center of this area will be used as a 5-star hotel. A. to builtB

问题补充：

The tall building in the center of this area will be used as a 5-star hotel.

A. to built

B. building

C. being built

D. having built

答案：

A. to built

B. building

(答案→)C. being built

D. having built

解析：句意：在这个中心正在被建的高楼将被用作5星级的旅馆。will be used是谓语动词，整个句子没有连词，所以空格处应该是非谓语动词，The tall building与build之间是被动关系，故排除ABD；根据句意故选C。