Do you know how the Great wall _____?

Do you know how the Great wall _____?
A、came about
B、came up
C、came into being
D、came out
【正确答案】：C
【题目解析】：come about 发生；come up 被提出；发生；come into being 形成； come out 出版；句意：你知道长城是怎么形成的吗？C 符合题意。