I met one of my students the other day. After several years, she changed a lot and looked different from ____ she used to be. 

A．that

B．whom

C．what

D．who

核定储备天数可根据（）推算，再根据计划期供应条件，对所得结果加以修正，确定计划期天数。

A.上年度储备天数

B.类似项目储备天数

C.上期实际储备天数

D.季节性储备天数