[讨论]天山-4-30

夜凉如水

sufficient与enough重复

yklinsmann

请问这道题选项D里为什么用were而不是用was? 急死了,问了半天了

SuccessMBA08

因为是shuttle and earlier spacecraft，两个名词组成的复合名词，用复数！！

kongkong57

thanks

suzy2728

with似乎也有可能是用来修饰前面的shuttle和spacecraft的，但是根据答案和句子本身推断，which后的一串应该是修饰spacecraft的吧

so the answer is D

feir2004

做比较题习惯了，看到unlike就想到比较对象对等问题，当看到 the shuttle and earlier spacecraft和 a  permanently orbiting space station时，想了半天他们是不是对等的，可是当看到the flights of the shuttle and earlier spacecraft 和a  permanently orbiting space station 时觉得更不可能对等，才排除了A/C/E. 答案虽然选了D,可是还是没想明白the shuttle and earlier spacecraft和 a  permanently orbiting space station真的对等吗？