— I've taken someone else's green sweater by mistake.

— It _____ Harry's. He always wears green.

[      ]

A. has to be

B. will be

C. mustn't be

D. could be

下列哪项不是肺不张的治疗原则（）

A.鼓励咳嗽排痰

B.纤维支气管镜检查

C.正压通气

D.雾化吸入

E.激素治疗