《金匮》认为杂病发病的主要因素为（）

A.客气邪风侵袭

B.七情

C.房室竭乏

D.五脏元真不足

E.虫兽、金刃灾伤

－I'm so sorry that you didn't win the skating marathon.

－How long _____ you ______?

－I skated for 5 hours.

A．have, been skating

B．were, skating

C．have you skated

D．did, skate