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I have finished a large part of the book ,the rest of which

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I have finished a large part of the book ,the rest of which ()more difficult . 为什么/
答案是 is
为什么?谢谢1
I have finished a large part of the book ,the rest of which (is)more difficult .
the rest of which 中which 指前面the book 即the rest of the book 意思是剩下的部分(比较难).这里把剩下的部分做一整体,就用单数来表示.