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将of改为by。
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将形容词complete改为副词completely。
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A．protestors used water cannons against riot policeB．riot police threw homemade firebombs at demonstratorsC．some active protestors were killed by the policeD．tears gas was resorted to by police against demonstrators
A．protestors used water cannons against riot police
B．riot police threw homemade firebombs at demonstrators
C．some active protestors were killed by the police
D．tears gas was resorted to by police against demonstrators
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