---Why are the housing prices in big cities going up all the time?---One reason is that p

问题补充：

---Why are the housing prices in big cities going up all the time?

---One reason is that people are into overcrowded cities in great numbers.

A. breaking

B. filling

C. pouring

D. hurrying

答案：

A. breaking

B. filling

(答案→)C. pouring

D. hurrying

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