英语 (29 16:13:14)
问题描述：
英语 (29 16:13:14)
2.Black boxes, to record Flight data together with pilots’ conversation and noises from the aircraft,are important for people to find out the cause of an air crash.
A.design B.designing
C.designed D.were disigned
要有分析过程
答
C.非谓语.黑匣子,被设计出来为记录航班……（设计和黑匣子是被动关系.）