单项选择题

We all feel sorry for ______ for so long after your arrival.

A．keep you waiting
B．having kept you waiting
C．waiting for you
D．keep you wait
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单项选择题
Not until most of the people had left the airport ______ his sister was there.
A．that he saw
B．had he seen
C．did he see
D．that he had seen
单项选择题
No one can possibly recall any detail about the meeting. It is at least five years since it ______.
A．had taken place
B．was taken place
C．took place
D．was taking place
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