精选优质文档-倾情为你奉上2018.4.21大学英语专业四级真题语言知识部分答案详细解析11.The Bent Pyramid outside Cario _ ancient Egypts first attempt to build a smooth-side pyramid.A.has been believed to have been B.was believed to be C.is believed to have been believed to be解析:C. is believed to have been. 位于Cariof附近的弯曲金字塔被认为是古埃及第一次尝试建造的一个表面光滑的金字塔。背景相关知识,弯曲金字塔,是公元前2600年由第一位法老萨夫罗修建的,位于距离Cario西南27公里处的地区,它是仅存的表面平滑金字塔之一,塔身弯曲。考点分析,sb/sth be believed to do/to be doing/to have done用法, sb/sth b