.The most ____news was that my parents were so ____with my school grades.

A．disappointed; disappointed

B．disappointing; disappointing

C．disappointed; disappointing

D．disappointing; disappointed

为了确定最晚开始时间的最晚完成时间，通过项目的网络逻辑，从最后的结点到开始的结点的计算被称为（）

A.顺推计算法

B.逆推计算法

C.逆向整合

D.垂直整合