单项选择题

Primary batteries of cells are those that, once ______, are discarded.

A．to be discharged
B．being discharged
C．discharged
D．discharging
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单项选择题
The boy was ______ by a milk float and taken to hospital.
A．run off
B．run out
C．run over
D．run through
单项选择题
What do you think of his motion that we ______ a play at the English evening
A．should put on
B．shall put on
C．would put on
D．will have put on
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