婴幼儿患上呼吸道感染后最严重的并发症是（）
A.鼻窦炎
B.中耳炎
C.喉炎
D.肺炎
E.咽后壁脓肿
参考答案：D
I ______ all the bookshops in our town for the book I needed but I couldn’t get one.
A．hunted
B．found
C．looked for
D．searched for
