I think recycling books and paper is really easy.这句话中为什么用is

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I think recycling books and paper is really easy.这句话中为什么用is
I think recycling books and paper is really easy.
这句话中为什么用is

I think recycling books and paper is really easy.这句话中为什么用is
指这件事很容易做,回收书和纸是一件事,用单数

books虽然是复数,但这里的宾语其实是recycling books and paper这件事,所以用单数。

recycling books and paper is really easy是宾语从句
在这个宾语从句中,recycling books and paper动词短语做主语,谓语动词用第三人称单数

recycling books and paper 做主语用单数