单项选择题

He was last seen in public on the ______ of his daughter's wedding.

A．event
B．occasion
C．chance
D．affair
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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
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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