填空题

In the course of history, people ______ (send) messages in many different ways.

【参考答案】

have sent
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填空题
is proud of
单项选择题
A．Certainly, I will.B．I don’t know.C．Never mind.D．I’m all right.
A．Certainly, I will.
B．I don’t know.
C．Never mind.
D．I’m all right.
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