烧伤最常见的并发症是：（）。

A.周身感染

B.呼吸衰竭

C.休克

D.急性肾功衰竭

E.应激性溃疡

He was very rude to the Customs officer, _____ of course made things even worse.                               

A．who

B．whom

C．that

D．which