单项选择题

-How did you pay，the workers
-As a rule，they were paid by ().

A. the hour
B. an hour
C. hour
D. hours

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单项选择题

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

A. plane
B. flight
C. fly
D. aircraft

单项选择题

There are () mistakes in her examination paper.

A. the
B. a little
C. much
D. a few

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