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.