what do you think is the most important helpful invintion?

What do you think is the most helpful invention,do you think what do you think( is/are ) the most important things 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 what do you think the most helpful invention is?可不可以把这个理解为一个 what do you think is most important,salary or advancement? what do you think is the most important in you life? 英语翻译翻译一下这句话2,what do you think is the most important to the What do you think is the most important according to the pas what do you think are the most important characteristics in 初三的几道英语习题1.What do you think is the most helpful invention?2 What do you think is the most important age in a person's li