单项选择题

I first met Lisa three years ago when we ______ at a radio station together.

A．have worked
B．were working
C．had worked
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单项选择题
Many ______ trees should be planted on the mountains.
A．thousand
B．thousand of
C．thousands of
单项选择题
The old man had to do all the farm work himself, ______
A．did he
B．didn't he
C．hadn't he
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