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(2013·寶雞中學(xué)月考)The Australian boy has a good ________ of Chinese and can express himself freely in it.
A．powerB．command
C．demandD．usage
B
B　句意：那位澳大利亞男孩漢語掌握得很好，他能用漢語自由表達他的意思。command“(尤指對語言的)掌握，運用能力”。
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