继发感染时，因左舌叶支气管开口接近背段支气管，故常见左下叶与舌叶支气管同时扩张。
参考答案：对
—Come on，please give me some ideas about the project.
—Sorry.With so much work ________ my mind，I almost break down.
A．filled
B．filling
C．to fill
D．being filled
It must be kept in mind that ____ lifelong study can you survive in the highly competitive society. [ ]
A. only when
B. until then
C. only through
D. until when
