单项选择题
Either your teacher or you ______ mistaken.
A．are
B．is
C．has
D．be
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单项选择题
______, we decided not to disturb him.
A．Tired although he was
B．Tired as he was
C．Tired though was he
D．As tired he was
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单项选择题
The committee ______ among themselves for four hours.
A．has been arguing
B．has been argued
C．have been arguing
D．have been argued
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