without the sun ,life as we know it_ A would not exist B would not have existed答案A为什莫不是Bwithout the sun ,life as we know it_ A would not exist B would not have existed答案A为什莫不是B
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![without the sun ,life as we know it_ A would not exist B would not have existed答案A为什莫不是Bwithout the sun ,life as we know it_ A would not exist B would not have existed答案A为什莫不是B](/uploads/image/z/10498636-28-6.jpg?t=without+the+sun+%2Clife+as+we+know+it_+A+would+not+exist+B+would+not+have+existed%E7%AD%94%E6%A1%88A%E4%B8%BA%E4%BB%80%E8%8E%AB%E4%B8%8D%E6%98%AFBwithout+the+sun+%2Clife+as+we+know+it_+A+would+not+exist+B+would+not+have+existed%E7%AD%94%E6%A1%88A%E4%B8%BA%E4%BB%80%E8%8E%AB%E4%B8%8D%E6%98%AFB)
without the sun ,life as we know it_ A would not exist B would not have existed答案A为什莫不是Bwithout the sun ,life as we know it_ A would not exist B would not have existed答案A为什莫不是B
without the sun ,life as we know it_ A would not exist B would not have existed答案A为什莫不是B
without the sun ,life as we know it_ A would not exist B would not have existed答案A为什莫不是B
without the sun ,life as we know it_ A would not exist B would not have existed答案A为什莫不是Bwithout the sun ,life as we know it_ A would not exist B would not have existed答案A为什莫不是B
A和B都是虚拟语气,因为没有太阳是虚拟的条件,B是虚拟过去时.A是虚拟现在时.选A是因为without sun 是对现在时态的虚拟.如果用虚拟过去时,应该说 If we hadn't had the sun,life as we know it would not have existed.
without 没有 就是表示否定的意思 不含有什么条件 没有太阳生命就不会存在。没有必要用B选项中的虚拟语气。