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14. Although the first part of the book is easy, the rest __

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14. Although the first part of the book is easy, the rest ______.A. are difficult B. has proved difficultC. is supposed difficult D. have been found difficult
为什么选B而不选A或别的?
为什么这本书的剩余部分不用复数
这是一个由although引导的让步状语从句,the rest指的是剩下的,其实完整的应该是"the rest part of the book",从这里可以看出谓语动词要用单三形式,所以排除A和D选项,
如果选择c,就应该是the rest is supposed to be difficult.短语是"be supposed to be +形容词“
通过这种方式就可以判断B选项是正确选项,明白了吗?
只要认真分析,就能判断.
再问: 那为什么这本书的剩余部分不用复数呢
再答: 因为the rest part of the book 和the first part of the book是对应的,可以看成一个整体。是书的前一部分和剩下的一部分。