Question

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

---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

Answer 1

：B

：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。