6. The Audubon Society and other conservation groups, concerned over what they （have perceived to be the serious threatening of the environment as） posed by the policies of the government, are preparing for a major political effort.
整句什么意思？Posed by修饰的是什么？难道分词也可以跳跃修饰？我记得只有that可以啊
(A) have perceived to be the serious threatening of the environment as
(B) perceived as the serious threat to the environment as
(C) perceive being the serious threat to the environment
(D) are perceiving as the serious threatening of the environment
(E) perceive as the serious threat to the environment
固定表达perceive …as…; threat to sth.
整个句子的主句是：The Audubon Society and other conservation groups are preparing for a major political effort.基本时态是现在时。
posed修饰threat
perceive为什么要被动呢？？
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