693.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.
(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
哪位可以把从句的正常顺序理一下？
they have pereived (the thing posed by the policies of the government) as the serious threat to the environment.这样整理对吗?
concerned over是什么意思？谢谢！
| 
