单项选择题

A. In a restaurant. B. In a hotel. C. In a plane. D. In a hospital.
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单项选择题
The workers were paid ______ in this factory.
A. by an hour
B. by hour
C. by the hour
D. by hours
单项选择题
I find it difficult to believe what he says ______ he never tells me the truth.
A. so
B. as

C. though
D. while
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