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
My father has classes_________ day: Mondays, Wednesdays and Fridays.
A．each other
B．every other
C．this and the other
D．all other
单项选择题
_________was once regarded as impossible has now become a reality.
A．What
B．That
C．Which
D．As
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