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1.People think ( )more and more( )to protect the environment

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1.People think ( )more and more( )to protect the environment.
A.that;impossible B.it;important C.this;necessary D./;interesting 选什么,理由充分
B
I think it important to keep healthy 与I think it is important to keep healthy
前一句没有从句,后一句有从句.
前一句中it是形式宾语,代指to keep healthy,important是宾补.
后一句中,it is...healthy是think的宾语从句,由that引导(已省略),it是从句中的形式主语,代指to keep healthy,is important是从句中的表语.