大全830-没有问过的

830。  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（B）

(E) unforeseeable weather conditions, and pilot errors often cause much larger deposits of spray than they had

想问一下，这里E错是因为THEY指代不清，但是E中的前半部分和B中的前半部分比有没有什么优先呢？weather conditions that cannot be foreseen, 和unforseeable weather conditions.两者是否相同呢？

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个人感觉没有什么差别