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
Susan's father, as well as her mother, ______ in New York.
A．work
B．is working
C．are working
单项选择题
Can I have the key ______ the front door，please
A．to
B．with
C．upon
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