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
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单项选择题
To keep______, we must do more outdoor exercises.
A．well
B．fine
C．fit
D．health
单项选择题
I prefer black shirts______ blue ones.
A．for
B．to
C．than
D．at
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