Which of these (do you think) is the most useful invention?
你觉得这当中的哪一个是最有用的发明呢?
此句非从句.do you think是插入语,去除之后对句子结构无影响.
该句本来结构为简单句 Which of these is the most useful invention?
选B才能满足do you think作为插入语的条件
Which of these (do you think) is the most useful invention?
你觉得这当中的哪一个是最有用的发明呢?
此句非从句.do you think是插入语,去除之后对句子结构无影响.
该句本来结构为简单句 Which of these is the most useful invention?
选B才能满足do you think作为插入语的条件