肺脓肿（）。

A.X线胸片见单个薄壁空洞

B.X线胸片有偏心空洞，内壁凹凸不平

C.X线胸片呈大片状阴影，呈肺叶或肺段分布

D.X线胸片呈大片状阴影，内为单个空洞伴液平

E.X线胸片上肺有小片状阴影伴空洞

There aren't many seats left for the concert; you had better make sure ________ two today. [ ]

A. getting  

B.  to have got

C. that you get  

D.  that you will get