单项选择题

Since our house was built 6 years ago its ______ are in need of repairing.

A．rooves
B．roof
C．roofes
D．roofs
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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
单项选择题
It happened to rain heavily ______ the morning of our marriage.
A．at
B．in
C．on
D．/
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