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History, 01.09.2019 02:50 qxchung9835
The great pyramids at giza are remarkable structures because a. they are still the most massive structures ever built by human effort
b. engineers have not figured out how they were built without modern technology
c.. they were the tallest man-made structures until the 20th century
d. they were the most massive man-made structures until the 20th century
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