单项选择题

We shall ask for samples________ and then we can make our decision.

A．to be sent
B．being sent
C．to sent
D．to have been sent
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单项选择题
It is important to remember the saying that________ is better than cure.
A．prevention
B．promotion
C．permission
D．proportion
单项选择题
Beijing is well_________ its beautiful scenery and the Great Wall.
A．known as
B．known to
C．known about
D．known for
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