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
The principal duty of the United Nations is to safeguard the peace of the world.
A．primary
B．prime
C．privileged
D．precedent
单项选择题
The employer tried to bully his employees from staging strikes by threatening to close down the entire plant.
A．intimidate
B．integrate
C．ridicule
D．humiliate
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