问题描述：
What do you think is the most useful invention?这句中do you think作插入语,
我们老师说后面用陈述句语序,为什么不是the most useful invention is?
Who is the man? 变成为什么 who do you think the man is?
我们老师说后面用陈述句语序,为什么不是the most useful invention is?
Who is the man? 变成为什么 who do you think the man is?
问题解答：
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