It is in that primary school ________ Mary once studied for six years that she will build a library，________ delights all the students and teachers in the school.

A．where；that

B．that；that

C．that；which

D．where；which

判断血栓闭塞性脉管炎的闭塞部位的准确方法是

A．肢体位置试验

B．静脉注射硫酸镁10ml

C．仔细检查肢体各动脉搏动情况

D．行交感神经阻滞

E．行动脉造影