单项选择题

He insisted that we ______ to pass the exam．

A． study harder
B． have studied harder
C． have studied harder
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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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