单项选择题

Space vehicles were launched into outer space_________ search of another living planet.

A．to
B．at
C．in
D．for
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单项选择题
The question_________ at the meeting tomorrow is very important.
A．to discuss
B．being discussed
C．to be discussed
D．will be discussed
单项选择题
People appreciate_________ with him because he has a good sense of humor.
A．to work
B．working
C．to have worked
D．have working
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