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
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
单项选择题
Next September, Ted and Marie______ for 20 years.
A．are married
B．have been married
C．will have been married
D．will marry
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