中泰铁路谈判:帮忙分析一下

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7. Is it necessary __________ the book immediately?
A. for him to return B. that he returns
C. his returning D. of him to return
请分析详细些

本题的选项中
A正确句型"It is + adj.+ for sb to do sth"是对某人行为的形容
B项that引导的是从句"it is ...that"是一种强调句型,例如It is me that help you resolve this problem.
C项是动名词结构,不可能引导后面的名词the book
D项"it is adj of sb to do"是对人的描述,比如kind,cool等

选A 他必须立即还书吗?

“It is + adj.+ for sb to do sth”是固定搭配

A 不定式的复合结构做主语
如选B,要用that he (should )return(为虚拟语气