According to some theories, the Giza Pyramids ___ using huge ...

[ Grammar ]

According to some theories, the Giza Pyramids ___ using huge mamuts to move the rocks.
A. might have been built
B. might have been builded
C. might had been built
D. might have being built

Select your answer:

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If you travel on one of these, an astronaut you must be. As it takes you to outer space, where there is zero gravity.

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