单项选择题

Our school singing group is going to give ______ performance next month; don't miss it.

A．an alive
B．a living
C．a live
D．a life
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单项选择题
______ their terms, we would go bankrupt.
A．If we accept
B．If we should accept
C．If we had accepted
D．If we are to accept
单项选择题
When our university laboratory bought this microscope we were given a one year's ______.
A．reservation
B．security
C．proof
D．guarantee
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