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
-- ______could I keep these books -- One month.
A．How often
B．How much
C．How long
D．How many
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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