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) (E) in that they are composed of tissues such as tooth and bone, tissues A为什么不对,我认为not normally found ...分词从句做定语做修饰 tooth and bone,请指正 |