单项选择题

Peter was seen crying when he came out of the office. We can deduce that he must have been punished.

A．confer
B．refer
C．prefer
D．infer
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They demand to set up an organization flexible enough to cope with any emergency.
A．portable
B．valiant
C．trivial
D．mobile
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To their great surprise, they found the floodwater had damaged the building's foundation.
A．underlain
B．underlined
C．undertaken
D．undermined
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