My son has changed so much that I could hardly his voice on the phone.A. recognizeB. real

问题补充：

My son has changed so much that I could hardly his voice on the phone.

A. recognize

B. realize

C. hear

D. find

答案：

(答案→)A. recognize

B. realize

C. hear

D. find

解析：动词辨析。recognize one’s voice 认出某人的声音；realize意识到；故答案为A。