It is quite clear that he has read the book.
副词接that从句疑问,不应该是形容词吗?
It为形式主语,is quite clear是系表结构作谓语,that he has read the book是名词性从句作真正的主语。句意:很明显,他已经读过这本书。又如:
It's clear that George Washington did not marry for love. 很显然,乔治·华盛顿不是因为爱而结婚。
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水平不断退步....形容词clear都不认识