单项选择题

All the machines ______ by the end of the following week.

A．were repaired
B．will be repaired
C．have been repaired
D．will have been repaired
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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
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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