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。
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