单项选择题

When climbing the hill, John was knocked unconscious by an______ rolling stone.

A．untouched
B．unfamiliar
C．unexpected
D．unbelievable
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单项选择题
My father has classes_________ day: Mondays, Wednesdays and Fridays.
A．each other
B．every other
C．this and the other
D．all other
单项选择题
The doctor will not perform the operation_________ it is absolutely necessary.
A．so
B．if
C．for
D．unless
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