单项选择题

When workers are organized in trade unions, employers find it hard to lay them______.

A．off
B．aside
C．out
D．down
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单项选择题
In the past 10 years, the company has gradually______all of its smaller rivals.

A．engaged
B．occupied
C．monopolized
D．absorbed
单项选择题
Floods cause billions of dollars worth of property damage______.
A．relatively
B．actually
C．annually
D．comparatively
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