单项选择题

I regret ______ so much time and money on stamps.

A．to waste
B．for wasting
C．having wasted
D．at wasting
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单项选择题
She is making herself iii with ______ over her son's future.
A．troubles
B．annoyance
C．worry
D．consideration
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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