单项选择题

It is a long time ______.

A．since I saw you last
B．after I saw you last
C．before I saw you last
D．when I saw you last
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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
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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