单项选择题

Gun control is a subject () Americans have argued for a long time.

A．of which
B．with which
C．about which
D．into which

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单项选择题
So sudden () that the enemy had no time to escape.

A．did the attack
B．the attack did
C．was the attack
D．the attack was
单项选择题
Critics believe that the control of television by mass advertising has () the quality of the programs.

A．affected
B．effected
C．lessened
D．declined
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