At the Copenhagen conference, all the countries were called on to do all they could to control greenhouse gas emissions________it was too late.

A．when

B．after

C．until

D．before

有一产妇，在分娩过程中大量出血，导致严重贫血。该患者血型为AB型RhD阴性，医院血库及血站无该血型的血液，应如何处理（）

A.输入B型血

B.输入A型血

C.输入O型血

D.配合型输血

E.大量输液