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单项选择题

The President was talking to all the department heads while a group of unexpected important clients had arrived for a talk with him.

A．when ... were arriving
B．as ... had arrived
C．when ... arriving
D．when ... arrived
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Some—such as liquid oxygen—are so cold that they embrittle many constructional materials and evaporate continuously if not refrigerated.
A．weaken
B．strengthen
C．reduce
D．cause ... to become brittle
单项选择题
Everyone must be responsible for their own behavior, and most of the young people today are interested, as far as I can perceive, in taking their knocks, just as adults must take theirs.
A．taking their jobs
B．sharing their ideas
C．assuming their responsibilities
D．shaking off their responsibilities
单项选择题
Traffic with criminals is dangerous.
A．dealing with criminals
B．tracking the criminals
C．fighting the criminals
D．transporting criminals
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