C本题考查句子结构及介词用法。空格所在句子中出现了倒装结构,由于其宾语intellectual exercises的后置定语较长,因此将宾补valueless提前。该句子的正常语序是Roman theorists ignored, or rejected intellectual exercises__3__valueless。能够引出宾补的介词只有[C]as,如I respect him as a doctor.(我尊敬他这个医生。)You can use that glass as a vase.(你