单项选择题

It is necessary that he______.

A．gives up trying
B．give up trying
C．would give up trying
D．is going to give up trying
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单项选择题
When and where the new hospital will be built______ a mystery.
A．to remain
B．remains
C．remain
D．is remaining
单项选择题
To keep______, we must do more outdoor exercises.
A．well
B．fine
C．fit
D．health
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