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20.--My daughter seldom has ______dinner.
--It is_____ unhealthy habit.You must ask him to change it.(  )
A./;anB.the;anC./;aD.the;a

分析 我女儿很少吃晚饭.
这是一种不健康的习惯,你必须要求她改变它.

解答 答案:A.根据语境dinner(晚餐)可知,一空处应为零冠词(三餐前零冠词),根据语境unhealthy (首音素/?/为元音音素)habbit(单数名词)可知泛指一种习惯,故第二空为an,故答案为:A.

点评 本题考查冠词的用法,泛指一类人或物用a或an.元音音素(注意不是元音字母)开头单词前用an,辅音音素开头单词前用a.特指某人、某物及乐器前用the.三餐前零冠词.

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