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  3. The spraying of pesticides can be carefully planned, but accidents, weather conditions that could not be foreseen, and pilot err

The spraying of pesticides can be carefully planned, but accidents, weather conditions that could not be foreseen, and pilot err

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问题 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.
选项 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 be foreseen, 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
答案B
解析 首先：weather conditions that cannot be foreseen是不可以改成unforeseeable weatherconditions，因为原从句中有情态动词，而改变后会缺乏情态动词所表示的语气(查阅公理中的最后一条)；D中的that are not foreseeable也改变了含有could的从句语气。C中are the cause of比用动词cause啰嗦。在A、B之间选择时，由于than anticipated是一种习惯表达，且简洁，因此选B。
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