单项选择题

Mary was () to school when she saw the accident.

A．on her way
B．in her way
C．by her way
D．in a way

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单项选择题

You may not go out to play games () you have finished your work.

A．as
B．while
C．until
D．when

单项选择题

The heavy rain()for several days and all the roads were flooded.

A．went up
B．kept on
C．fell down
D．broke down

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