◎ 题干
选择适当的句子填入空白,使对话完整。(其中有两项是多余的)
a. What is it used for?
b. May I ask you a question?
c. Sorry.
d. What is it used for?
e. I think
f. What is it?
g. Do you know
A: Hello, Peter! 1.             
B: Certainly! 2.             
A: Which of these do you think is the most useful invention, a computer, a telephone or a television?
B: 3.             the most useful one is a computer.
A: Why is that?
B: Oh, I think it can help us work and play.
A: 4.             when it was invented?
B: 5.            , I don't know.
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◎ 解析
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◎ 知识点
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