The building is reported to down last month.A.be torn B.have been tornA为什么不可以?

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The building is reported to down last month.A.be torn B.have been torn
A为什么不可以?

因为建筑物被拆是发生在谓语动词is reported 之前, 所以用不定式的完成式to have torn
A 是一般式, 表将来的.所以不能选
不定式的完成式的形式为:
to have + 过去分词

可以改写为:
It is reported that the building was torn down last month.
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