单项选择题

Please say hello to Mr. Smith. Not ______ his address, I can't visit him personally.

A．known
B．to know
C．know
D．knowing
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单项选择题
The phrase an attractive offer (Line 2, Para. 1) in the passage probably means ______.
A．valuable products
B．a good mailing list
C．direct mail marketing
D．something cheap
单项选择题
What is considered most important in direct mail marketing
A．Writing a friendly letter.
B．Giving a low price.
C．Getting the right names.
D．Mailing a list of customers.
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