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As ________ rule, apples are sold by ______ weight and eggs by _______dozen.
A.a; 不填;theB.a; the; theC.a; a; theD.the; 不填;不填
A

试题分析:考查冠词。第一空用a泛指一条规则,第二空和第三空是by的用法,如果by后面的名称是抽象名词的时候就不加构成,如by weight按照重量;如果by后面的名词是单位名词那么就在单位名词前面加the,如by the dozen按照打。故A正确。
点评:冠词的考查集中在定冠词the表示特指,不定冠词a/an表示泛指;以及冠词的一些特殊用法和固定词组如all of a sudden等,还有一些不使用冠词的情况,如抽象名词,物质名词前面就不要冠词。
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