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
I prefer black shirts ______ blue ones.
A．for
B．to
C．than
D．at
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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