单项选择题

“What happened”“We __________ for an hour when the bus finally came”

A．waited
B．have waited
C．have been waiting
D．had been waiting
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单项选择题
In the West children begin to study their native languages and a foreign language to gather in primary school and begin __________ in middle school
A．third
B．a third
C．the third
D．thirdly
单项选择题
We can sail there in an hour, if the wind is favorable __________ us．
A．of
B．at
C．with
D．to
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