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
It is said that science has become too complex to acknowledge the existence of universal truths.
A．address
B．declare
C．affirm
D．perceive
单项选择题
In the country we are excluded from the worries of life in a big town.
A．enveloped
B．protected
C．insulated
D．subtracted
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