单项选择题

I didn't hear the phone. I()asleep.

A. must be
B. must have been
C. should be
D. should have been

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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
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
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