what is on earth the answer ?

primefang

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

Pls help Tongxun

tongxun

这题考的是固定搭配：perceive as。threatening 不如threat作为名词来的简洁。
B中的as 。。as的用法导致拘役错误。所以，答案为E。

guoguo

怎么又选e了，我好不容易才接受了d的答案，不是有位高人说d的时态好么？
我本来也选d啊，我时态最弱了，不要折腾我啊

tongxun

牛牛：对不起！经再三考虑 the serious threatening of the environment ，我认为这句话的意思象：环境的威胁。与威胁环境就不一样了，再加上我上面所讲的.In sum, I concur that the choice E is the best answer. Although there are some niurens who chosed D , for many reasons it is a good idea to choose E because I am preparing my AWA. hahaha.