As a result, Man may disappear ____ who became too overspecialized, oroutlived their environment.
A. as other specials do
B. as do other species
C. as have other specials
D. as were other species
答案选 C 。
1、没搞懂为何是用 have 跟倒装。
2、还有就是 as 在这里是做连词吧？
3、这里有省略成分吗？感谢！
As a result, man may disappear as have other species who became too overspecialized, or outlived their environment.
这是 as 引导方法状语从句（正如......），演变一下：
As a result, man may disappear as other species have . 因此，人类或许会像其他物种一样消失。从句用目前完成时，因 disappear 重复，一般承前省略。
可以倒装，提前操作词 have，照顾匀称，特别 species 后面有非常长的修饰成分（定语从句）时。
1. As a result, man may disappear as have other species .
2. As a result, man may disappear as have other species who became too overspecialized, or outlived their environment.
