do you think/suppose/believe是用于特殊疑问句中的插入语的。
原句：
Who is the best student in our class?
因为主语就是who，所以就在who后插入do you think
Who do you think is the best student in our class?
如果疑问词不是主语，就得改语序了。
What is he doing?
What do you think he is doing?
Do you think who is the best student in mour class?
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