单项选择题

The lady has been asking her boss ______two days off since last week.

A．with
B．/
C．for
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单项选择题
Great changes______ place since he left here.
A．have been taken
B．have taken
C．were taken
单项选择题
Do the trains always run______
A．on time
B．in time
C．the same time
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