单项选择题

A group of youngsters sat under the big tree ______.

A．chatting and laughing
B．chatted and laughed
C．was chatting and laughing
D．was chatted and laughed
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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
单项选择题
Not until the bell had rung ______ the classroom in a hurry.
A．he came into
B．did he come into
C．he has come into
D．has he come into
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