－Hello mum. Are you still on Lushan Mountain?－Oh no. We are back home. We a really good

问题补充：

－Hello, mum. Are you still on Lushan Mountain?

－Oh, no. We are back home. We a really good journey.

A. have

B. had

C. are having

D. will have

答案：

A. have

(答案→)B. had

C. are having

D. will have

解析：考查动词时态的用法。句意：你好，妈妈，你仍旧在庐山吗？——哦，不。我们回家了。我这个旅程玩的真的很高兴。结合语境可知下文描述的是过去（回家前）发生的动作，故用一般过去时态。故选B。