男，71岁。二型呼吸衰竭，血气分析显示呼吸性酸中毒，最佳的治疗措施是（）。

A.解除肺不张

B.控制肺部感染

C.改善通气功能

D.雾化吸入及吸痰

E.深呼吸，有效排痰

— He was nearly killed in a car accident the other day.

— Oh, when was ________ exactly?

— It was on April 28 ________ he was riding a bike on the driveway.[ ]

A. this; that  

B. that; when

C. that; that  

D. this; when