单项选择题

I wonder how long ago this school __

A．has begun
B．begins
C．began
D．has started
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单项选择题
He failed his exam, __ proved that he wasn’t working hard enough.
A．what
B．which
C．this
D．of which
单项选择题
If only we __ then the disease was curable.
A．knew
B．could know
C．had known
D．would have known
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