There are eight tips in Dr.Roger's lecture on sleep，and one of them is：________ to bed early unless you think it is necessary.

A．doesn't go

B．not to go

C．not going

D．don't go

关于预激综合征合并心房颤动的治疗，下列哪项描述是错误的（）

A．禁用洋地黄类药物 

B．禁用钙通道阻滞剂 

C．禁用β受体阻滞剂 

D．可联合应用钙通道阻滞剂与β受体阻滞剂 

E．可使用IC类抗心律失常药物