单项选择题

Either Peter or Paul ______ to stay after class.

A．has
B．have
C．has had
D．have had
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单项选择题
I'm sure it won't be long before people are living and working in ______ space.
A．/
B．the
C．a
D．an
单项选择题
Roentgen won ______ 1901 Nobel Prize.
A．/
B．the
C．a
D．an
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