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单项选择题

A．with
B．by
C．without
D．in
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单项选择题A．put onB．put outC．put upD．put down

A．put on
B．put out
C．put up
D．put down

单项选择题How does Dr. William N. Green go to work

A． By car.
B． By bus.
C． By subway.