单项选择题

Rice (has been) a (basically) food for (millions of) people for (hundreds of) years.

A．A
B．B
C．C
D．D
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单项选择题
I (am looking) forward (to) (receive) your letter! she said (happily).
A．A
B．B
C．C
D．D
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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