"But for your help,we-----应该选择哪个答案?A.couldn't have succeeded.B.shouldn't have succeeded."

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"But for your help,we-----应该选择哪个答案?A.couldn't have succeeded.B.shouldn't have succeeded."
"But for your help,we-----应该选择哪个答案?A.couldn't have succeeded.B.shouldn't have succeeded."

"But for your help,we-----应该选择哪个答案?A.couldn't have succeeded.B.shouldn't have succeeded."
B
but for引导的虚拟语句
should'n have done是固定句式

B虚拟语气 选should的

a

a
没有你的帮助我们就不能成功
but 相当于 without
a 翻译为 过去本不能做却做到了
b 翻译为 过去本不应该却

A but for 引导虚拟语气 AB都用了虚拟语气
但根据句意,如果没有你的帮助,我们不可能完成任务。
A指本不能B指本不应该做什么

选 A

b 虚拟语气的考察

a
b的意思----->我们不应该成功 太怪了吧!

b