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题库 / Prep2007E2-SC-111
Astronomers have uncovered evidence that a star that was as bright as the full moon exploding into view 340,000 years ago, emitting dazzling radiation that could have disrupted Earth's protective ozone layer and sunburned our Stone Age ancestors.
that a star that was as bright as the full moon exploding into view 340,000 years ago, emitting
that a star as bright as the full moon exploded into view 340,000 years ago, emitting
of a star that was as bright as the full moon exploding into view 340,000 years ago and that it emitted
of a star as bright as the full moon, exploding into view 340,000 years ago and emitting
of a star as bright as the full moon that exploded into view 340,000 years ago and that emitted
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C、E不平行，and that意味着前方需要有一个that引导的从句
D，抽主干Astronomers have uncovered evidence of a star，相比于evidence that，后者在句意上更合适。详细说明了evidence的内容
A，从句中缺少谓语
B correct
establishing the intended meaning is ALWAYS the FIRST STEP of ANY sentence correction problem!
without the intended meaning, most splits are actually impossible to decide, since the vast majority of grammar rules just serve to specify the meaning of whatever construction.
1）evidence 后面接 that clause，作 evidence 的同位语句，解释说明 evidence；
2）时态：340,000 years ago = 时态关键词，所以动词 explode 用过去时；
3）修饰语 as bright as the full moon 修饰 star，意思是 ...的星星；
4）doing sth. 放句末，作结果状语，其逻辑主语为 a star exploded into view 340,000 years ago
A：evidence that 引导的从句结构不完整
当句子主体结构已经改变的时候，主谓宾及定状补，不需要再看细节方面的对错，从句子结构所表达的语意入手来判断优劣。
后面的could have 表示可能已经破坏了地球的臭氧层，以及晒伤了我们石器时代的祖先（而不是晒伤了我们）进一步表明这个辐射是在过去发生的，而不是一个通常的状态，所以这里emitting作exploded的伴随状语是可以的。
B，that a star as bright as the full moon exploded into view 340,000 years ago, emitting……，主体是that a star exploded, emitting修饰exploded，意思是在爆炸时发出能破坏地球臭氧层的辐射
E，that exploded 和that emitted会误会是在修饰moon
选项A Astronomers have uncovered evidence that a star （that was as bright as the full moon exploding into view 340,000 years ago）括号里是修饰a star的，所以that从句不完整
of更像是在修饰star本身，而不象在说整个star的状况
句子结构：Astronomers have uncovered evidence that…为句子主结构(第一层次)。 That引导从句解释evidence的内容，为第二层次。从句内部主结构为: a star exploded into… emitting 现在分词位于句尾，用逗号(;)与前句隔开，作为伴随状语修饰前句，逻辑主语与前句主语相同， 为star。伴随状语部分that引起限定性定语从句(第三层次)修饰radiation，该定语从句内部两个动词 要求平行：could have disrupted and sunburned….
A. evidence that… 从句中的句子无谓语：a star (that was as bright as the full moon) exploding…;emitting看似与exploding平行，但缺少连词建立这两个动词之间的关系。
B. 正确，详见“句子结构”分析。
C. Evidence of a star不如evidence that…表达有效。该选项，that成为修饰star的定语从句，整个句子的主结构变成：Astronomers have uncovered evidence of a star――宇航员发现了关于某颗恒星的证据，至于原句要强调的证据的具体内容，被定语从句给“淹没”了;该选项存在平行的两个定语从句：a star that… and that…。第二个定语从句中it多余，that已经指代主语star，it同指代主语star，使这部分从句出现双主语。
D. Of应该为that
E. Of应该为that;that位于moon之后，引导的定语从句错误地修饰了moon。