单项选择题

______ , he forgot all his trouble.

A．Once he being on the stage
B．Once being on the stage
C．Once on the stage
D．Once being he on the stage
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单项选择题
The supply and demand of agricultural products are ______ balanced.
A．on purpose
B．on average
C．in advance
D．in general
单项选择题
He has worked very hard ______ he entered the factory.
A．when
B．till
C．while
D．since
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