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1.        Teratomas are unusual forms of cancer because they are composed of tissues such as tooth and bone not normally found in the organ in which the tumor appears.

(A) because they are composed of tissues such as tooth and bone

(B) because they are composed of tissues like tooth and bone that are

(C) because they are composed of tissues, like tooth and bone, tissues

(D) in that their composition, tissues such as tooth and bone, is

(E) in that they are composed of tissues such as tooth and bone, tissues

答案：E。请教为什么A是不对的？可否把A理解为tooth and bone后面省略了that are， 后面not normally found in...是修饰tooth and bone的呢？E选项后面补出了同位语结构tissues， 后面的not normally found in就是修饰tissues了。是否AE两个选项从基本语法角度都没有什么问题，只是从逻辑上考虑，后面的not normally found in...修饰更广泛的tissues更合理些所以才舍A选E呢？还是因为A有什么其它的硬伤？请nn多多指教！