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A new library _____ in our school now.

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A new library _____ in our school now.
A.is building B.is being built C.is built D.will build
不知道为何是选B的.
不是同样是进行时吗?
难道build是短暂性词?不能用进行时?
= =如果是这样求类似的词.
B is being built 被动进行时,答案正确
A is building 进行时,因为主语是library 与build 是动宾关系,句子不可以用主动句,只能用被动