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这里的A省略了什么呢?好难啊,请NN指教,10号就考了
upup!!
known as 和 known to 都是可以的
为什么不选d呢?
不解!
having been done/ having done ...is normally not preferred
相对而言A好。
B C E都缺谓语,错。
D中that从同位语变为了定语。
A也有疑问, 我觉得have应改为has。The number of应该也有修饰animal species。如果不存在修饰关系应该改为animal species and the number of plant
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