单项选择题

______his address, I can't send this book to him.

A．Not knowing
B．Knowing
C．Not know
D．N6t known
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单项选择题
-- Never thought to see you here. --______
A．So did I.
B．Oh, haven't you
C．It's a small world.
D．I'm well. Thank you. And you
单项选择题
If you want______, you should speak slowly and clearly to the listeners.
A．to be understood
B．to understand it
C．understanding
D．to understood
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