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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
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E项除了固定搭配be known to do错了以外，还有问题是把species做了主语，但已知的应该是人是species 灭绝
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