Forty minutes _____ for the children to finish all the work. [ ]

A. is quite a long time

B. are quite long

C. was a quite long time

D. were quite long time

关于咳嗽，描述正确的是（）

A.干咳仅见于肺癌早期

B.只有在呼吸道感染时才能引起咳嗽

C.中枢神经因素引起的咳嗽，是从脑桥发出冲动所致

D.支气管扩张症咳嗽往往于清晨或夜间变动体位时加重，并伴咳痰

E.感染时引起的咳嗽较重，非感染因素引起的咳嗽较轻