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:
A B C D E

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So or Such Subject-Verb Agreement Passive with Modals Past Perfect Simple Present, Past, and Future Time Relative Clauses beginning with Prepositions Simple Present & Present Progressive The Past Simple Conjunctions and Transitions Conjunctive Adverb

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