单项选择题

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

A．have worked
B．had been working
C．were working
D．had worked
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单项选择题
All the leading newspapers ______ the trade talks between China and the United States.
A．reported
B．printed published
C．announced
D．published
单项选择题
The boy wanted to ride his bicycle in the street, but his mother told him ______.
A．not to
B．not to do
C．not do It
D．do not
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