单项选择题

Alice __ my letter; otherwise she would have replied before now.

A．ought to have received
B．haven’t received
C．has been received
D．couldn’t have received
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单项选择题
I wonder how long ago this school __
A．has begun
B．begins
C．began
D．has started
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
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