The Bent Pyramid outside Cairo______ancient Egypt’s first attempt to build a smo

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问题 The Bent Pyramid outside Cairo______ancient Egypt’s first attempt to build a smooth-sided pyramid. (2018-11)

选项 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 C

解析被动语态。在英语中有一种主动句可以转换为两种被动句，如：People believe that he is ill．→(I)It is believed that he is ill．／(II)He is believed to be ill．当(I)中that-从句谓语动词为表示过去时间的一般过去时或者是现在完成时，则(II)中的不定式结构均转换为完成体形式，即to have+-ed。本题句干属于句型(II)，根据句意判断其相应的句型(I)应为：It is believed that the Bent Pyramid outside Cairo was ancient Egypt’s first attempt to build a smooth-sided pyramid．故本题答案为C。

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