单项选择题

No sooner had they got the goods covered up ______ it started raining hard.

A．when
B．than
C．then
D．after
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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
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
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