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
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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
单项选择题
Many modern photographers attempt to manipulate elements of photography other ______ in their photographs.
A．than light is
B．than light
C．being light
D．light
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