扫描二维码，直接登录
题库 / Prep2007E2-SC-83
The number of plant and animal species that humans are known to have forced to extinction in the last half millennium is over 800.
humans are known to have forced to extinction
humans are known as having forced to become extinct
humans are known for forcing to become extinct
are known that humans forced to become extinct
are known as having been forced to extinction by humans
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
"known as" is incorrect unless it is followed by a noun:
Albert Einstein made his living as a patent clerk, but he was far better known as the original proponent of the theory of relativity.
--> correct (note that "proponent" is a NOUN)
登录 或 注册 后可以参加讨论