2. 外语
  3. Astronomers at the Palomar Observatory have discovered a distant supernova explosion, one that they believe is a type previously

Astronomers at the Palomar Observatory have discovered a distant supernova explosion, one that they believe is a type previously

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问题 Astronomers at the Palomar Observatory have discovered a distant supernova explosion, one that they believe is a type previously unknown to science.
选项 A、that they believe is
B、that they believe it to be
C、they believe that it is of
D、they believe that is
E、they believe to be of
答案E
解析 one指代a distant supernova explosion，划线部分对此explosion作同位解释，that的先行词是one。A错在believe is连用，B、C中出现了个it.从句意上讲，it指an explosion，这就与引导词that产生重复，排除B、C。很多人在D、E之间不知如何选择，因为D、E似乎都对。他们说把explosion代入that从句中，D变为they believe that the explosion is a type….E变为they believe the explosion to be of a type．．．。的确，从语法上讲，两者都没有错，believe后可跟动词不定式，也可跟宾语从句。在这里，需要注意到it is sth．和it is of sth．的细微区别。在中学学过“be+of+抽象名词”这样的结构，表明“某物具有某种属性”。如：This matter is of greatimportance．译为“这件事具有极大的重要性”而不译为“这件事是重要性”。同理，本句中，原意是要说明“此爆炸属于一类我们未知的爆炸”而不说“此爆炸是一类爆炸”，后者逻辑不通。故选E。
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