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xdf补充练习33
33.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. (B)weather conditions that cannot be foreseen, and pilot errors often cause much larger deposits of spray than (D)weather conditions that are not foreseeable,and pilot errors often cause much larger deposits of spray than could you tell me why B is better than D? thanks
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