— Liu Jun knows a lot about New York.

— So he does. I heard he ____ before.[ ]

A．had gone there

B．had been there

C．has gone there

D．has been there

《热论》"热遗"产生的原因是（）

A.热甚而强食

B.单感寒邪

C.两感于寒

D.劳倦过度

E.以上均是