My uncle from Hongkong has changed so much that I could hardly him at the airport. A. un

问题补充：

My uncle from Hongkong has changed so much that I could hardly him at the airport.

A. understand

B. realize

C. recognize

D. know

答案：

A. understand

B. realize

(答案→)C. recognize

D. know

解析： recognize认出(原来认识的人或物)；realize意识到，实现。