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
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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
单项选择题
If Phillip didn't leave his office before six, he ______ back home yet.
A．can't be
B．needn't be
C．won't be
D．must not be
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