My elder brother was interested in improving his management skills. He becomes so successful now.
A. If my elder brother wasn’t interested in improving his management skills, he could not become so successful now.
B. If my elder brother isn’t interested in improving his management skills, he cannot become so successful now.
C. If my elder brother hadn’t been interested in improving his management skills, he could not become so successful now.
D. Even though my elder brother wasn’t interested in improving his management skills, he has become so successful now.

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