单项选择题

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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单项选择题
In this monumental work the entire storehouse of the world's art is surveyed.
A．impressive
B．expressive
C．progressive
D．possessive
单项选择题
Crew chiefs supervised engines, switches and lights that told them how each item of equipment was functioning.
A．observed
B．preserved
C．monitored
D．nurtured
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