Itisknowntousthatittakesyearsof

发布时间:2020-07-26 10:57:42

It is known to us that it takes years of ________ practice to gain ________ skills of ________ expert.A.不填; the; anB.不填; the; theC.the; the; anD.a; 不填; the

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A解析practice为不可数名词,此处泛指“实践”,所以不用冠词.expert可数名词,此处表示“一个专家”.因有定语修释,所以skills前使用定冠词.
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