问题补充：
Do you know when the Great Wall ?
A. was come into being
B. came into being
C. had come into being
D. had been come into being
答案：
A. was come into being
(答案→)B. came into being
C. had come into being
D. had been come into being
解析：考查时态。句意：你知道长城是什么时候形成的吗？长城的形成是过去发生的事情，所以使用过去时。Come into being形成，没有被动语态。故B正确。
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