I think——(this,that,it)is very useful to learn english well.填那个,

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Ithink——(this,that,it)isveryusefultolearnenglishwell.填那个,Ithink——(this,that,it)isveryusefultolearnen

I think——(this,that,it)is very useful to learn english well.填那个,
I think——(this,that,it)is very useful to learn english well.填那个,

I think——(this,that,it)is very useful to learn english well.填那个,
绝对it啦~给分给分~

it 形式宾语

it

it,I是主语,think是谓语,后边是it引导的从句

选it!