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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单项选择题
The boy wanted to ride his bicycle in the street, but his mother told him______.
A．not to
B．not to do
C．not do it
D．do not
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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