Look ! The building which now will be used as a library.
A. is being built
B. to be built
C. is built
D. being built
网友回答
(答案→)A. is being built
B. to be built
C. is built
D. being built
解析：which now是定语从句，根据now，从句谓语要用现在进行时态，且主语which，即The building，和build是动宾关系，所以用现在进行时态的被动语态。选A。