The young girl sitting next to me on the plane was very nervous. She ____ before. [ ]

A. hasn't flown

B. didn't fly

C. hadn't flown

D. wasn't flying

患者男，75岁，因“反复咳嗽、咳痰伴喘息，活动后气促5年”来诊。有吸烟嗜好。血气分析：PaO₂77mmHg（10.2kPa），PaCO₂51mmHg（6.8kPa）。胸部CT：肺纹理增多，肺透光度增加。肺功能：FEV₁/FVC＜0.70，50%预计值≤FEV₁＜80%预计值。

对该患者的基础治疗错误的是（）

A.戒烟

B.注射流感疫苗

C.吸入肾上腺皮质激素

D.吸入β₂-受体激动药

E.吸入短效支气管扩张药