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3.一What do you think of the grammar book?
一Oh,it is really      useful book,which is worth reading      second time.(  )
A.an; aB.an; theC.a; aD.the; the

分析 -你觉得这本语法书怎么样?-哦,它确实是一本很有用的书,非常值得再读一遍.

解答 正确答案:C.根据句意第一空泛指这是一本有用的书,且useful首字母发辅音音素/ju:/,故用不定冠词a,按排除法可直接排除ABD,故选项C.第二空是序数词前用不定冠词a,表示再、又.worth doing sth.表示某事值得做.

点评 本题考查不定冠词a,基础题也是易错题,如不认真审题第二空部分同学看到序数词前应用定冠词the而误选D项,所以一定要仔细审题,掌握不定冠词a的用法.

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