单项选择题
A．efficiency
B．proficiency
C．success
D．use
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单项选择题
A．consumerB．consumingC．consumptionD．consumptive
A．consumer
B．consuming
C．consumption
D．consumptive
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单项选择题
A．toB．againstC．forD．by
A．to
B．against
C．for
D．by
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