单项选择题

Nobody yet knows how long and how seriously the shakiness in the financial system will ______ down the economy.

A．settle
B．knock
C．put
D．drag
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单项选择题
Joseph is so brilliant that he always keeps some good ideas ______ his sleeve.
A．up
B．in
C．at
D．on
单项选择题
Hardly had her husband uttered the words ______ Lucy began crying.
A．as
B．before
C．since
D．while
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