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标题: question [打印本页]

作者: hopelanxyn 时间: 2007-6-14 03:32
标题: question

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

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

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

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

why choose E? what's the role of the second "tissues"?

thanks

作者: s7s7 时间: 2007-6-14 09:28
没有tissues，后面的定语修饰错

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