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【题目】— My brother often eats sweets before sleep.

— Oh, what ________ unhealthy habit!

A.aB.theC.an

【答案】C

【解析】

句意:——我哥哥经常睡前吃甜食。——哦,多么不健康的习惯啊!

考查不定冠词和定冠词的辨析。a是不定冠词,放在辅音音素前面,表示泛指;an是不定冠词,放在元音音素前面,表示泛指;the是定冠词,表示特指或者上文提及的内容。根据句意表示泛指一种,habit习惯是可数名词,所以用不定冠词;unhealthy首字母发/ /元音音素。故选C

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