(2013·重庆高考)When I was little, my mother used to sit by my bed, ________ me stories till I fell asleep.

A．having told

B．telling

C．told

D．to tell

支气管扩张发病的机制是（）

A.支气管-肺组织感染及阻塞

B.肺结核

C.肿瘤压迫

D.支气管先天性发育缺损和遗传因素

E.支气管内结石