问题标题：
Hehadbeenaworkerbeforehebecameateacher与Hewasaworkerbeforehebecameateacher区别
问题描述：
Hehadbeenaworkerbeforehebecameateacher与Hewasaworkerbeforehebecameateacher区别
刘志文回答：
1.他在成为教师之前一直是一位工人.
2.他是成为教师之前曾经是一位工人.
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