he become a dentist in 2000改写句子
问题描述：
he become a dentist in 2000改写句子
he become a dentist in 2000（保持原句意思）
he has ____ ____ a dentist ___ about five years.
还有1题
J.K is one of my favourite writers .保持愿意
J.K is _________ my favourite writers
答
he has been become a dentist for about five years