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

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单项选择题
You look tired; you() have stayed up late last night.

A．should
B．must
C．would
D．may
单项选择题
--Sorry, I made a mistake again.-- (). Practice more and you'll succeed.

A．Not at all
B．Certainly not
C．Never mind
D．Don't mention it
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