be动词为什么能和do一起使用;是什么用法?我英语书上有who do you think is the funniest

be动词为什么能和do一起使用;是什么用法?我英语书上有who do you think is the funniest what do you think is the funniest people? Who do you _____is the funniest actor? A．think B．think over how old do you think he is?和who do you think is the best stu who do you think the best man is?还是who do you think is the b Do you think who the best student is?还是Do you think who is t who do you think is the riched the man // do you think who i Who is the best actor do you think What do you think is the Who do you think the listeners might be Who do you think.和Do you think who. who do you think 和do you think who区别 the phone is ringing,who do you think __ is?