---- We’re leaving for Hainan the day after tomorrow.

---- Wow, have a good trip. And by the way how long ______ there?

A．have you stayed

B．are you staying

C．had you stayed

D．did you stayed

下列药物中，能燥湿止带的是：( )

A．防风

B．白芷

C．羌活

D．苍耳子

E．藁本