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
此题考查的是非谓语动词。 本句的主干是“Black boxes are important for people to find out the cause of an air crash”,因此,可以排除掉A和D选项——同一个句子里,不能同时有两个谓语动词。 而______ to record Flight data together with pilots' conversat...