Who do you think is the best performer?

这个句子就是用的陈述语序,Who在句中作主语.但不是宾语从句.
do you think 只是插入语,整个句子仍然是一个特殊疑问句
这叫双重特殊疑问句,其结构为:
疑问词+插入语(do you think)+其余部分(必须用陈述语序)
如:Where do you think we will meet tonight
Who do you think he is talking with
Which class do you think Li Wei is in