The magnificent museum is said ___about a hundred years ago.A.to be built B.to have been built C.to have built D.to have being built

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The magnificent museum is said ___about a hundred years ago.
A.to be built B.to have been built C.to have built D.to have being built

B 据说一百年前就已经被建造了

B. to have been built

我认为是A,一百年前建的,过去式,而不是完成式。
还有,老师都有教有ago时不能用完成时态,before才用完成时态。

b