，周二就考了，请教一道prep 的语法题

59. 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

给出的答案是E,可是E的主语Indications 和谓语is,明显是单复数不一致啊？请高手指点一下

哈哈，这道题当时我也没看明白，现在明白了。

Among the surest indications on Earth of sunspot cycles is believed to be the rate that trees grow是一个倒装句。

它的正常语序是：the rate that trees grow is believed to be among the surest indications on Earth,

意思是说太阳黑子在地球上有个很充分的对应标志之一是树木的生长率。（大概这么翻译)

这是倒装句喔，看到副词词组(adv. phase)在句首，就要想一下是不是倒装句，所以动词的判断要往后看。

Among the surest indications on Earth of sunspot
cycles is believed to be the rate at which trees grow….

主词是rate，所以单数