单项选择题

Mr. Brown did not tell us（）or not he'll be leaving next week.

A．whether
B．if
C．either
D．weather

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单项选择题
At the party, everybody congratulated the scientist（）winning the award after his years of hard work.

A．to
B．on
C．at
D．about
单项选择题
He could repair the car himself but he would rather his son（）it.

A．do
B．to do
C．did
D．has done
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