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
Unless bad weather ______ me, I will go for a walk tomorrow.
A．will stop
B．stops
C．stop
D．should stop
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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