单项选择题

In most western countries, according to the report, workers are paid ______.

A．by hour
B．by the hour
C．in hour
D．in an hour
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单项选择题
It happened to rain heavily ______ the morning of our marriage.
A．at
B．in
C．on
D．/
单项选择题
As is known to all, friendship is ______ great importance in people's life.
A．in
B．of
C．with
D．for
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