两个选项好像一样啊。。。

lllmmm

The spraying of pesticides can be carefully planned, but accidents, weather conditions that could not be foreseen, and pilot errors often cause much larger deposits of spray than they had anticipated.
A.    weather conditions that could not be foreseen, and pilot errors often cause much larger deposits of spray than they had
B.    weather conditions that cannot be foreseen, and pilot errors often cause much larger deposits of spray than
C.    unforeseeable weather conditions, and pilot errors are the cause of much larger deposits of spray than they had
D.    weather conditions that are not foreseeable, and pilot errors often cause much larger deposits of spray than
E.    unforeseeable weather conditions, and pilot errors often cause much larger deposits of spray than they had

B  D好像一样啊

毛毛carina

选B

考察两个方面：代词和平行

代词：they的指代不清排除ACE
平行：BD的区别只在于 cannot be foreseen 和 are not foreseeable。 未划线的句子“The spraying of pesticides can be carefully planned” ，所以B正确
另外，我觉得动词优先的原则也是可以排除D而选择B的

毛毛carina

以前的讨论帖：http://forum.chasedream.com/GMAT_SC/thread-463750-1-8.html

lllmmm

谢谢！