当我做这道题的时候，我在B和D之间徘徊！但是答案是B!能不能哪个大N解释一下！！

小黛安

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.
weather conditions that could not be foreseen, and pilot errors often cause much larger deposits of spray than they had
weather conditions that cannot be foreseen, and pilot errors often cause much larger deposits of spray than
unforeseeable weather conditions, and pilot errors are the cause of much larger deposits of spray than they had
weather conditions that are not foreseeable, and pilot errors often cause much larger deposits of spray than
unforeseeable weather conditions, and pilot errors often cause much larger deposits of spray than they had

sanlingjie

原句的情态动词一般是不能够省略的

lianlonger

foreseen是过去分词，表示已经被预知到。比foreseeable好