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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单项选择题
The bookcase __ when we were moving it.
A．damaged
B．has damaged
C．was being damaged
D．got damaged
单项选择题
The grape is the ____, juicy fruit of a woody wine.
A．smooth-skinned
B．skinned is smooth
C．skin, which is smooth
D．smooth skin
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