单项选择题

— ______ could I keep these books — One month.

A．How often
B．How much
C．How long
D．How many
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Would you like a cup of coffee first, ______ shall we get down to business right now
A．then
B．when
C．or
D．otherwise
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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