单项选择题

A．put on
B．put out
C．put up
D．put down
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单项选择题
How does Dr. William N. Green go to work
A． By car.
B． By bus.
C． By subway.
单项选择题
A．whenB．orC．butD．if
A．when
B．or
C．but
D．if
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