it was unusual_____ snow in this regiton.a.there to be b.for .there to be选什么,为什么

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it was unusual_____ snow in this regiton.a.there to be b.for .there to be选什么,为什么
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it was unusual_____ snow in this regiton.a.there to be b.for .there to be选什么,为什么
it was unusual_____ snow in this regiton.a.there to be b.for .there to be选什么,为什么

it was unusual_____ snow in this regiton.a.there to be b.for .there to be选什么,为什么
B it + adj+ for sb.to do..

it + adj+ for sb. to do..
这是个固定用法表示 对某人来说做某事怎样

首先,要明确这三个东西的区别来自它们本身,跟there be句型没关系。也就是说,无论是不是there be句型,现在分词、过去分词与to do的区别都是一样的。