单项选择题

The medicine has many functions,（）are unknown to us.

A．which of some
B．some of which
C．of which some of them
D．that some of them

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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
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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