单项选择题

The higher the standard of living and the greater the national wealth, ______

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

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单项选择题

Silver is the best conductor of electricity, copper______it closely.

A．followed
B．following
C．to follow
D．being followed

单项选择题

He ______unwisely, but he was at least trying to do something helpful.

A．may have acted
B．must have acted
C．should act
D．would act