求分析prep一道语法题

schlaf

83.(28949-!-item-!-188;#058&004110)



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



(A) humans are known to have forced to extinction

(B) humans are known as having forced to become extinct

(C) humans are known for forcing to become extinct

(D) are known that humans forced to become extinct

(E) are known as having been forced to extinction by humans
这句话是什么意思啊？是说因为人类灭绝的种类么？ 恳请 明白的童鞋分析下划线部分句子成分

Alexandraross

答案是選擇a?
The number of plant and animal species that humans are known to have forced to extinction in the last half millennium is over 800.
句型是：be known to do sth.
這裡是表示完成，所以是humans are known to have forced(done) plant and animal species to extinction.
已知的被人類xxx的植物和動物種類數量是xxx。
hope this helps.

schlaf

明白了，那么force 的用法是：force sth to sth么？