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
Nobody yet knows how long and how seriously the shakiness in the financial system will ______ down the economy.
A．put
B．settle
C．drag
D．knock
单项选择题
The British are not so familiar with different cultures and other ways of doing things, ______ is often the case in other countries.
A．as
B．what
C．so
D．that
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