单项选择题

Since we have never been here before, we do not know which bus ().

A．should we take'
B．to be taking
C．to take
D．should take

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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

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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