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单选题
279.The Bent Pyramid outside Cario __________ ancient Egypt’s first attempt to build a smooth-sided pyramid.
A
has been believed to have been
B
was believed to be
C
is believed to have been
D
is believed to be
答案解析
正确答案：C
解析：
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。
相关知识点：
被动语态时态判断
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