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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单项选择题
It ______ seen to be believed.
A．has
B．has been
C．has to be
D．was
单项选择题
Dr. Smith failed many times but he finally ______ to find a successful way to solve the problem.
A．broke off
B．broke down
C．broke out
D．broke through
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