When we visited Hainan again ten years later we found it changed so much that we could ha

问题补充：

When we visited Hainan again ten years later, we found it changed so much that we could hardly it.

A. remember

B. think about

C. believe

D. recognize

答案：

A. remember

B. think about

C. believe

(答案→)D. recognize

解析：本题的含义是海南发生了很大改变，几乎认不出了，recognize表示认出的意思，故本题选D。