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The Bent Pyramid outside Cairo----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
答案是C，由于建造金字塔，这个动作先于is believed发生。为何C不可以？把这件事当成一个事实？
答案是C，为什么C不可以？搞不了解问的什么，应该是为什么D不可以吧。D你可以把其当成一个事实，但这个事实中的attemp虽然是个名词，暗含动作，这个动作是过去发生的。
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