Conservative philosophers argue that the very structure of society is threatening by civil
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Conservative philosophers argue that the very structure of society is threatening by civil disobedience, while humanists stress the primacy of the individual conscience.
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正确答案：threatening--threatened
考查被动语态。be动词和介词by同时出现是被动语态的信号，它们之间的动词要用过去分词形式。此处threatening应改为threatened。