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. the time
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单项选择题
In no case______the students from exploring new ideas.
A. we should prevent
B. we could prevent
C. should we prevent
D. shouldn't prevent
单项选择题
It suddenly______to me that we could use a computer to do the job.
A. happened
B. occurred
C. agreed
D. presented
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