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 is hot and dry, and the flowers need______.
A．being watered
B．be watered
C．to water
D．to be watered
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