严重挤压伤伤员，当伤肢局部明显肿胀，伴有静脉回流障碍时，局部处理应当首先考虑（）

A.切开减压

B.制动

C.固定抬高

D.理疗

E.穿刺抽出积血

They have no idea at all  ________. 

A．where has he gone

B．where did he go

C．which place he has gone

D．where he has gone