—You seemed not to be interested in the story yesterday.

—Yes. I      it in a magazine before.

A．read

B．was reading

C．have read

D．had read

脑室外引流拔管正确的是（）。

A.开颅手术后脑室引流4～7天

B.拔管前行头颅CT检查，并夹闭引流管3天

C.夹管期间注意患者神志、瞳孔及生命体征变化

D.有颅内压增高症状也可拔管

E.拔管时可不夹闭引流管