单项选择题

The population of the world is growing at a dangerous ______.

A．step
B．measure
C．rate
D．progress
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单项选择题
Neither Mary nor her sister ______ to the party.
A．go
B．are going
C．have gone
D．is going
单项选择题
Just because he failed once, it does not ______ that he will fail every time.
A．follow
B．happen
C．appear
D．seem
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