I will ask her for the book now, for she ____ plenty of time to read since I lent it to her.

A．has

B．has had

C．had had

D．was having

下列关于药物被动转运的叙述哪一条是错误的

A．药物从浓度高侧向浓度低侧扩散

B．不消耗能量而需载体

C．不受饱和度限速与竞争性抑制的影响

D．受药物分子量大小，脂溶性，极性的影响

E．当细胞膜两侧药物的浓度平衡时转运停止