单项选择题

He has devoted his life ______ disabled people.

A．to helping
B．to help
C．helping
D．help
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单项选择题
His father had promised to buy him a computer ______ he behaved himself.
A．in case
B．while
C．after
D．provided
单项选择题
Fortunately, the bank clerk ______ press the alarm button before the robbers got away.
A．could
B．succeeded in
C．was able to
D．managed
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