Which of these do you think is the most useful invention?中do you think 为什么不能换为you thinkdo you think 为什么不能换为you think?you think 是陈述语序,前面已有which of these做疑问,为什么还要用do you think呢?请再举一些例子说明

问题描述:

Which of these do you think is the most useful invention?中do you think 为什么不能换为you think
do you think 为什么不能换为you think?you think 是陈述语序,前面已有which of these做疑问,为什么还要用do you think呢?
请再举一些例子说明