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A．But
B．Why
C．When
D．As well as
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单项选择题The higher the standard of living and greater the national wealth, the ______.

A．greater is the amount of paper is used
B．greater the amount of paper is used
C．greater amount of paper is used
D．amount of paper is used is greater

单项选择题The president didn't mind ______.

A．not invited
B．not being invited
C．having not been invited
D．not to have been invited