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
By 1929, Mickey Mouse was as popular ______ children as Coca-Cola.
A．for
B．in
C．to
D．with
单项选择题
Because Edgar was convinced of the accuracy of this fact, he ______ his opinion.
A．struck at
B．strove for
C．stuck to
D．stood for
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