单项选择题

Recent study shows that regular review leads to () performance on tests.

A．improve
B．improves
C．improved
D．improvement

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单项选择题
The 850 British Airways () flew from Houston to London at its usual time.

A．fly
B．aircraft
C．plane
D．flight
单项选择题
You look tired; you() have stayed up late last night.

A．should
B．must
C．would
D．may
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