--- What’s the matter? You are like that for a few minutes.

--- Well, it is bound     . I’m thinking if we need get the wet clothes back to the room.

A．to rain

B．to have rained

C．rained

D．raining

贵重药材为防止有效成分被其它药渣吸附需另煎的是（）

A.三七.鹿茸.紫河车

B.沉香.豆蔻.羚羊角

C.琥珀.雷丸.苦杏仁

D.人参.西洋参.西红花