— Have you ever visited the Water Cube?

— Yes. When I served as a volunteerin Beijing, I            it twice.[      ]

A. have visited

B. visited

C. had visited

D. had been visiting

消风散的组成药物中含有（）

A.荆芥、防风、牛蒡

B.荆芥、白芷、牛蒡

C.荆芥、薄荷、秦艽

D.荆芥、白芷、羌活

E.防风、薄荷、升麻