关于急性脓胸的治疗方法，下列哪一项是错误的（）。
A.消炎疗法
B.开放引流
C.支持疗法
D.闭式引流
参考答案：B
—Why did you leave without a word of warning to Robert?
—But what _______ otherwise? He never likes to listen to me.[ ]
A. could I do
B. could I have done
C. must I have done
D. should I do
CRH2型动车组同节车两转向架中心距为（）。
A、175000mm
B、176000mm
C、178000mm
D、177000mm
