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
By the time she takes the entrance examination, Louis ______ Spanish for five years.
A．had been studying
B．has studied
C．will have been studying
D．will study
单项选择题
The girl agreed to marry the young man ______ that he bought a car for her.
A．only if
B．on condition
C．on purpose
D．on occasion
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