2. 外语
  3. Total color blindness, ______, is the result of a defect in the retina.

Total color blindness, ______, is the result of a defect in the retina.

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问题 Total color blindness, ______, is the result of a defect in the retina.
选项 A、a rare condition that
B、a rare condition
C、that a rare condition
D、is a rare condition
答案B
解析 同位语结构题。本句已有的部分结构完整，补充部分可以是名词或名词词组作主语的同位语，四个选项中只有[B]正确。
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