旧PREP 139题

dengyichao

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
...is believed to be among...这样的句式倒装以后是among...is believed to be...的形式吗？这样原来句子的主语不就放到be之后了吗？
而且B的表达为什么不行？

fiaoyaya

后面一句的their trunks中的their是指trees，因此前面必须要有trees而且需要和后面的句子靠得近。B前面的句子说的是tree而不是trees。倒装是可以的，在语法大全里面有很多例子。

dengyichao

对，重点在这个their上，谢谢！