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The Australian boy has a good _____ of Chinese and can communicate with others freely.
A.requestB.commandC.demandD.usage
B

试题分析:此处request要求;command命令;demand要求; usage用法。这里have a command of意为:掌握。故选B。句意:这位澳大利亚男孩掌握了汉语并能用汉语和别人自由的交流。
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