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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单项选择题
Do the trains always run______
A．on time
B．in time
C．the same time
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
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