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
Today, housework has been made much easier by electrical _________.
A．appliances
B．facilities
C．apparatus
D．equipment
单项选择题
The voice was so __________ that only those with keen hearing were aware of it.
A．soft
B．gentle
C．faint
D．dim
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