Do you know _________ at this time yesterday?[ ]

A. what she is doing

B. what is she doing

C. what she was doing

D. what was she doing

“无论是客户经理还是产品经理都必须要密切跟踪和关注产品的销售情况和客户的满意度，了解客户的特殊需求，做好产品信息的跟踪反馈”，是产品全生命周期管理中哪个环节的工作。（）

A.产品设计和开发

B.产品推广

C.产品销售和跟踪反馈

D.产品后评价和退出