单项选择题

John is an excellent boss ______ he is looked up to by all of his employees.

A．but
B．and
C．while
D．or
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单项选择题
Under ______ circumstances will latecomers be admitted to the conference.
A．no
B．any
C．all
D．some
单项选择题
I know this is the fight train. The ticket agent said it would be on ______.
A．Track Two
B．the Two Track
C．Second Track
D．the Track Second
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