单项选择题

We visited the room（）they used as their lab last semester.

A．which
B．in that
C．where
D．in which

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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
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
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