Not having a good ________ of English can be a serious barrier to achieving your goals.
A．demandB．a(chǎn)ppreciationC．commandD．experience
C

這題考查固定詞組：having a good command of“精通”，句意是：不能精通英語可能是你取得成功的嚴(yán)重的障礙。選C。
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