问题
选择题
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
答案
答案：A
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。