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On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow, as seen in the rings visible in the cross sections of their trunks.
(A) On Earth, among the surest indications of sunspot cycles are believed to be the rate that trees grow
(B) On Earth, among the surest indications of sunspot cycles are, it is believed, the rate of tree growth
(C) On Earth, the rate at which trees grow is believed to be among the surest indications of sunspot cycles
(D) Among the surest indications on Earth of sunspot cycles, believed to be the tree growth rate
(E) Among the surest indications on Earth of sunspot cycles is believed to be the rate at which trees grow
答案是E. 句子是全倒装，那么C为什么不对？这里有必要一定倒装吗？
呵呵，我认为c中as seen in the rings visible in the cross sections of their trunks变成是修饰cycles,修饰对象错误。另外c中缺乏宾语。句子成分残缺——the rate is believe to be后面缺少宾语，另外on earth 的修饰对象错误， 本应是修饰indications，变成了修饰整个句子
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