一道KAPLAN SC

Kilroy

(During the 18th century roughly 0.5 grams of gold are estimated to have left Colombia, Peru and Hadi and supplied) 80% of the world’s total quantity of recovered gold.
B) During the 18th century it is estimated that roughly 0.5 grams of gold left Colombia, Peru and Hadi and supplied
C) It is estimated that during the 18th century roughly 0.5 grams of gold left Colombia, Peru and Hadi, supplying
答案C。 为什么B中不能用supplied与left并列呢？

tongxun

kilroy：用并列会将前后的因果关系给断开。

z_weining

我觉得更重要的时，During the 18th century 这种时间状语只能放在句首或句尾，放在中间，会出现修饰上的混乱，不知道是该修饰前半部分，还是後半部分。

拙见！：）

tongxun

B中的这个时间状语的位置是不好。因为估计的时间不是在18世纪。

princess

同意tongxun
B中it is estimated放在时间状语和动词中间，使得句子不流畅

PS：这道题刚刚做到，呵呵

zyh79

对estimate的用法值得总结，具体参见lzm( p274)