单项选择题

The problem has been ______ my mind all day.

A．preying on
B．getting at
C．taking on
D．seeing to
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单项选择题
Two trucks were reported to have ______ head-on yesterday.
A．bumped
B．crashed
C．collided
D．struck
单项选择题
Some people think it's ______ to smoke with a cigarette holder,
A．flexible
B．sophisticated
C．versatile
D．productive
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