单项选择题

Please be sure to telephone me the next time you ______.

A．will come
B．would come
C．shall come
D．come
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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
单项选择题
______ seems easy in theory seems difficult in practice.
A．That
B．With
C．What
D．It
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