To fetch water before breakfast seemed to me a rule__________.[ ]

A. to never break          

B. never to be broken  

C. never to have broken    

D. never to be breaking

金葡菌肺炎患儿突然出现呼吸困难、憋气。应首先考虑（）

A.肺炎加重

B.心力衰竭

C.脓气胸

D.肺部多发的小脓肿

E.化脓性胸膜炎