what do you think is the most useful invention in the world

what do you think is the most useful invention in the world What do you think is the most useful invention?这句中do you thi 连词成句 What do useful you think invention is the fourth most Do you think what invention is the most useful 这句话对吗 Which of these do you think is the most useful invention?中do What do you think is the most helpful invention,do you think what do you think is the most helpful invention.为什么不是What do 急：为什么What do you think is the most helpful invention?和what d A:____ do you think is the most interesting invention? what do you think the most helpful invention is?可不可以把这个理解为一个 most,you,is,the,inveresting,think.invention,do,what(连词成句） what do you think is the ___(annoy) invention?