问题描述：
He is now sales manager of a large company
,but did you know in order to survive he -part-time jobs for six years
Adoes Bdid Chas done Dhas been doing
为什么选B for six years 不是完成时吗
,but did you know in order to survive he -part-time jobs for six years
Adoes Bdid Chas done Dhas been doing
为什么选B for six years 不是完成时吗
问题解答：
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