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 此题的答案是A 我想请教下同学们,A选项把定语从句还原就是 humans are known to species。这样意思不就变成了动物所熟知的人类。 而原句要表达的意思不是说人类所熟知的动物吗?是否应该改成species that are known to human 呢?