题目内容

Look ! The building which _________now will be used as a library.
A.is being builtB.to be builtC.is builtD.being built
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。
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