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【题目】Science is ______ useful subject though it is a little difficult.

A. an B. a C. the D. /

【答案】B

【解析】

句意:科学是个有用的科目,尽管它有点难。根据不定冠词a/an一个,通常用于泛指,a用于辅音因素开头的单词前,an用于元音因素开头的单词前;定冠词the这个,那个,通常用于特指,这里一泛指一门有用的学科,辅音因素开头;故选B

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