【題目】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】

考查過去分詞。句意：沒有一條蛇會習(xí)慣性地攻擊人類，除非它的生命受到威脅。此處句子主語snake和threaten之間是被動關(guān)系，所以unless和過去分詞threatened構(gòu)成條件狀語，故選B。

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