---Have you ever been here before?---No. this is the first time that I to the Great Wall.A

问题补充：

---Have you ever been here before?

---No. this is the first time that I to the Great Wall.

A comes B have been C came D had been

答案：

解析：：考查特殊句型用法。句式：It/this is the first time后面的从句使用现在完成时。如果前面是was,后面要使用过去完成时。故B正确。