单项选择题

So absorbed（）in his work that he didn't realize I was standing behind him.

A．he was
B．did he
C．was he
D．he did

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单项选择题

She told me that she（）you in Paris a year before

A．met
B．had met
C．has met
D．would met

单项选择题

（）, they waved again and again to us.

A．When leaving
B．To leave
C．Being leaving
D．Having left

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