补全对话
从方框中选出适当的句子,完成对话,有两项为多余选项。
A:Hello,Peter!
B:Certainly!
A:Whichofthesedoyouthinkisthemostusefulinvention,acomputer,atelephoneora
television?
B:
A:Why is that?
B:Oh, I think it can help us work and play.
A:
B: , maybe it was invented in 1946.