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单选题
11.The Bent Pyramid outside Cario（ ）ancient Egypt’s first attempt to build a smooth-sided pyramid.
A
A. has been believed to have been
B
B. was believed to be
C
C. is believed to have been
D
D. is believed to be
答案解析
正确答案：C
解析：
考察时态。sb./sth. be believed to do 将来时态， 代表某人某物被认为将要做某事； sb./sth. be believed to be doing 现在时态,某人或某事物正在做某事；sb./sth. be believed to have done 过去时态， 代表某人某事物被认为应该做过某事。金字塔建于古代埃及，不定式表示的动作先于 is believed 发生， 因此不定式需要用完成时态，选 C。A 选项has been believed...一直被认为，不符合。句意：开罗城外的弯曲金字塔被认为是古代埃及首次尝试建造的表面平滑的金字塔。
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