18. What made the city of Machu Picchu become one of the most powerful cities in South America?
(A) This city was founded by powerful European explorers.
(B) This city was home to the Incan emperor.
(C) This city was the capital of the Incan empire.
(D) Many tourists visited the city to climb the steps.
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統計: A(14), B(191), C(40), D(18), E(0) #3343163
統計: A(14), B(191), C(40), D(18), E(0) #3343163