单项选择题

No sooner had they got off the train ______ it started moving.

A．when
B．than
C．then
D．after
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单项选择题
I am very sorry for ______ for so long.
A．keep you waiting
B．having kept you waiting
C．waiting for you
D．keep you wait
单项选择题
Not until I reminded him for the third time ______ working and looked up.
A．that he stopped
B．does he stopped
C．did he stop
D．that he stop
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