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    【题目】There’s no snake known that will habitually attack human beings unless _______ with its life.

    A. threaten B. threatened

    C. threatening D. having threatened

    【答案】B

    【解析】

    考查过去分词。句意：没有一条蛇会习惯性地攻击人类，除非它的生命受到威胁。此处句子主语snake和threaten之间是被动关系，所以unless和过去分词threatened构成条件状语，故选B。

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