单项选择题

______ is well known, light, like heat, is a form of energy.

A．It
B．What
C．Just as
D．As
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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
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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