水平一体化的概念
参考答案：
各公司都只保留核心业务，将不擅长的业务外包，通过并购同种业务的企业，实行水平一体化
下列各句中划线词语在文中的意义与现代汉语相同的一项是( )
A．吾尝为鲍叔谋事而更穷困
B．俗之所否，因而去之
C．鲍叔不以我为愚
D．鲍叔不以我为不肖
She had just finished her homework _____ her mother asked her to practice playing the piano yesterday. [ ]
A. when
B. while
C. after
D. since
