单项选择题

I left a suitcase ______ the train the other day．

A．at
B．in
C．on
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单项选择题
She ______ the floor yesterday．
A．wept
B．sweep
C．swept
单项选择题
Susan's father, as well as her mother, ______ in New York.
A．work
B．is working
C．are working
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