__we could not have finished the work on time.
A should they not offer to help usB but for their help
想知道A错误在哪里,如何改.答案是B.
人气：158 ℃ 时间：2019-10-29 06:32:15
解答
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
供参考.
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