单项选择题

Nobody can do two things well ______.

A．at one time
B．at once
C．one time
D．once
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单项选择题
She is stronger than ______.
A．the two
B．any two
C．another two
D．the other two
单项选择题
Alexander Graham Bell invented ______ telephone in 1876.
A．one
B．a
C．the
D．none of the above
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