单项选择题

Perhaps there is still quite a long way to go______ these researchers can find an answer to the mystery.

A．unless
B．until
C．where
D．before
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单项选择题
He is a boy of promise; he never fails to ______the expectations of his parents and teachers.
A．live up with
B．stand up with
C．live up to
D．stand up for
单项选择题
The Minister of Finance stresses that the quality of goods, ______the quantity production, is the key to improving the nation's economy.
A．other than
B．better than
C．more than
D．rather than
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