Do you know when the Great Wall ?A. was come into beingB. came into beingC. had come into

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A. was e into being
(答案→)B. came into being
C. had e into being
D. had been e 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。