The teacher left word with our monitor _____ she would explain the problem again next time.

A．who

B．which

C．as

D．that

关于结合胆红素的叙述，错误的是

A．和清蛋白结合
B．和葡萄糖醛酸结合
C．极性强，便于随胆汁排出
D．分子小，可被肾小球滤过
E．与重氮试剂直接反应，呈紫红色