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    精英家教网 > 高中英语 > 题目详情

    Thes chemical ,_______to kill biological organisms ,are unsafe and oten not specific in their targets .


    1. A.
      having designed
    2. B.
      to design
    3. C.
      designing
    4. D.
      designed
    D
    这题考查过去分词的用法，be designed to do，“被设计做…”，design和chemical是被动的关系，句意是：被设计来杀死生物有机体的化学物质是不安全的，不能完全针对它们的目标。选D。
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