单项选择题

There may be, somewhere outside the solar system, intelligent life ______ messages to us.

A．sends
B．sent
C．sending
D．has sent
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单项选择题
______ seems easy in theory seems difficult in practice.
A．That
B．With
C．What
D．It
单项选择题
It is much easier to talk about social change than ______.
A．to bring it about
B．to bring it on
C．to bring it up
D．to bring it out
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