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

The young man assured the boss that he would ______all his energies to do the job well.

A．call on
B．call forth
C．call at
D．call off

单项选择题

The old farmer was run down by a car. He was taken to the hospital and______ on by the chief surgeon right now.

A．operated
B．having been operated
C．is operated
D．is being operated