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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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
单项选择题
The bookcase __ when we were moving it.
A．damaged
B．has damaged
C．was being damaged
D．got damaged
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