John has great singing but to become a real singer he needs a lot of necessary training

问题补充：

John has great singing , but to become a real singer, he needs a lot of necessary training and practice.

A. privilege

B. potential

C. promotion

D. possibility

答案：

A. privilege

(答案→)B. potential

C. promotion

D. possibility

解析：名词辨析。A特权；B潜力；C提拔，促销；D可能性。句意：John有歌唱方面的潜力，但是要想成为真正的歌手，他还需要很多的训练和练习。根据句意说明B正确。