Historians debate how the Great Pyramids of Giza were constructed with such precision. While some scholars think the stones _________ using massive ramps, others believe that a system of internal spiral tunnels was utilized.
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writingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
moved
B
are moving
C
were moved
D
had been moved
Correct Answer: C
Choice C is the best answer. The sentence describes a theory about a past event. The passive voice in the simple past tense ("were moved") is required because the stones received the action.