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18.It may not be        good university.But before        is found,we'll have to go there.(  )
A./;a good oneB.a;a better oneC./;the best oneD.a;a best one

分析 它可能不是一个好大学.但是在找到更好的之前,我们将不得不去那里.

解答 答案:B.a用于辅音音素开头的词前;题干中的"一所好大学",表泛指,"good university"中的good的读音是辅音因素开头,应用冠词a;
is found是被发现;将还未发现的好大学与现有的大学进行对比,应该用形容词比较级a better one,这里是两者作比较根据语境判断此处是与前面提到a good university相比较,所以应该用比较级,泛指一个更好的大学.故选B.

点评 用a还是用an一般说来,在辅音因素开头的词前用a,而在元音音素开头的词前用an; 然后再根据题干选出正确的选项.

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