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
This city made ______ progress in such a short time.
A．remarkable
B．gradual
C．sufficient
D．essential
单项选择题
______ that your son is well again, you no longer have anything to worry about.
A．Since
B．Now
C．When
D．After
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