大全885 SECTION17-19 快救命啊!

19.   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

能讲解一下其他选项的错误吗??谢谢啊!!!