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题目
__we could not have finished the work on time.
A should they not offer to help us B but for their help

想知道A错误在哪里,如何改.答案是B.

提问时间:2020-10-09

答案
从句子的后半段可以推断,本题考查的是对过去虚拟.
A是对将来虚拟的形式.对过去虚拟的从句结构应当是
if ther had not offered to help us
或 had they not offered to help us
所以不选A
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