问题
选择题
--- How did you pay the workers? --- As a rule, they were paid ______.
A．by hour
B．by the hour
C．by hours
D．by an hour
答案
答案：B
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--- How did you pay the workers? --- As a rule, they were paid ______.
A．by hour
B．by the hour
C．by hours
D．by an hour
答案：B