单项选择题

What does the word "go-betweens" mean in the last paragraph（）

A．Online shopping.
B．Going from one place to another.
C．Traveling between two places.
D．Persons or companies that pass messages between sellers and buyers

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单项选择题

5（）

A．used to be
B．is used to
C．has used to
D．used to

问答题

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