单项选择题

She ______ the floor yesterday．

A． wept
B． sweep
C． swept
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单项选择题
Susan's father, as well as her mother, ______ in New York.
A． work
B． is working
C． are working
单项选择题
You'd better ______ it again．
A． not do
B． not did
C． did not
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