单项选择题

I slipped and fell while I______.

A．am cleaning windows
B．clean windows
C．was cleaning windows
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单项选择题
Henry ______be at home because he telephoned me from Paris just a moment ago.
A．needn't
B．isn't able to
C．can't
单项选择题
Great changes______ place since he left here.
A．have been taken
B．have taken
C．were taken
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