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HefounddifficulttoimprovehisEnglish……?为啥横线里填it而不是it's?

题目详情
He found ____ difficult to improve his English……?
为啥横线里填it而不是it's?
▼优质解答
答案和解析
我认为单看这个句子it和it's应该都可以,He found it difficult to improve his English句中it是形式宾语,而真正的宾语为动词不定式to improve his English
而He found it's difficult to improve his English句中 it's difficult to improve his English是find后面的一个宾语从句,句中it为形式主语.