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初三英语语法习题,求解释_________ ,we could not have finished the work o

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初三英语语法习题,求解释_________ ,we could not have finished the work on time
为什么选择 But for their help 不选was it not for their help 或者 should they offer to help
如果要用was it for their help ,就是用于现在相反的虚拟语态,但是给出的句子后半部分,不符合主句用would/ should/ could/ might +动词原形的形式,所以不是虚拟句.
就应该用but for,做让步状语从句.
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