A. The Great Pyramid of Giza is said to have been built over a 20-year period.
B. The Great Pyramid of Giza are said to have been built over a 20-year period.
C. The Great Pyramid of Giza is said to have been built over a 20-years period.
D. The Great Pyramid of Giza is said to has been built over a 20-year period.
A
Đáp án A
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