单项选择题

72（）

A．for
B．by
C．with
D．in

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单项选择题
Many a player who had been highly thought of has ______ from the tennis scene.
A．disposed
B．disappeared
C．discouraged
D．discarded
单项选择题
The university has launched a research center to develop new ways of ______ bacteria which have become resistant to drug treatments.
A．regulating
B．halting
C．interrupting
D．combating
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