It is now impossible to assess whether such research is of an ______ or defensive nature.

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问题 It is now impossible to assess whether such research is of an ______ or defensive nature.

选项 A、active
B、offensive
C、alive
D、optional

答案B

解析 该句意为:现在无法判定此类研究是进攻性的还是防御性的。该句的选项要参考defensive一词,与其相反的就是offensive:冒犯的,不礼貌的,进攻性的;optional:选择性的,选修的。
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