单项选择题

"I (am looking) forward (to) (receive) your letter!" she said (happily).

A．A
B．B
C．C
D．D
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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
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
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