单项选择题

When ______ through a circuit, the current will lose part of its energy.

A．flowing
B．being flowed
C．flowed
D．having flown
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单项选择题
The rest of his life is ______ to the cause of international exchange of visiting scholars.
A．added
B．put
C．saved
D．committed
单项选择题
You won't know if it fits you until you ______ it on.
A．will try
B．are trying
C．are to try
D．have tried
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