_________ his dream  he has to study harder than before.

A．Achieving

B．A chieve

C．To achieve

D．To come true.

下列哪种疾病会使纵隔扑动（）

A.进行性血胸

B.闭合性气胸

C.张力性气胸

D.肺爆裂伤

E.多根多处肋骨骨折