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
My students found the book ______ , it providing them with an abundance of information on the subject.
A．enlightening
B．confusing
C．distracting
D．amusing
单项选择题
He has failed me so many times that I no longer place any ______ on what he promises.
A．faith
B．belief
C．credit
D．reliance
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