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
Amy is much ______ than her younger sister．
A．pretty
B．prettier
C．more pretty
单项选择题
We haven't got many ______ ，but we've got a lot of
A．tomatos，potatos
B．tomatos，potatoes
C．tomatoes，potatoes
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