单项选择题

The student did his homework ______ his professor had assigned.

A．when
B．as
C．until
D．if
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单项选择题
If you are not happy with what you have got now, what makes you think that you will be happier with ______
A．anything
B．some
C．more
D．less
单项选择题
You never get ahead of anyone ______ you try to get even with him.
A．as long as
B．as well as
C．as much as
D．as far as
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