单项选择题

It is generally believed that swimming is one of the best ways for a person to _________ good health.

A．reserve
B．sustain
C．preserve
D．maintain
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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
Tom was so obviously sorry for his mistake that we __________ him.
A．forgave
B．pardoned
C．excused
D．punished
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