发现一道新PREP题并请教

phylicia · 发表于 2007-4-20 17:47:00

The number of plant and animal species that humans are known to have forced to extinction in the last half millennium is over 800.

答案就是A。选项BCD都很容易排除，就是E很奇怪，我选错了，请教大家：）

E，are known as having been forced to extinction by humans

遥远的绿洲 · 发表于 2007-4-20 18:40:00

be known as + 职业等名词表示因做...而出名

用在这里不合适

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