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