Not until _________ did man accept that fact that all living things must die.

A．did many years pass

B．many years past

C．many years had passed

D．many years have passed

若某投资项目可行，则（）。

A.NPV≥国家颁布值

B.NPV≥0

C.NPV＜企业可以接受水平

D.NPV＞初始投资