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
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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
单项选择题
In this factory the machines are not regulated ______ but are jointly controlled by a central computer system;
A．independently
B．individually
C．irrespectively
D．irregularly
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