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
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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
单项选择题
It ______ seen to be believed.
A．has
B．has been
C．has to be
D．was
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