【正确答案】 C

【答案解析】such...as引导定语从句。如：We have found such materials as are used in their factory．我们找到了像他们厂里用的那种材料。(such在句中作宾语。) Such people as you describe are rare nowadays．你描述的这种人现在已经很少了。(such在句子中作主语。)