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
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
C
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