请问，为什么这道英语题选CTheytheproblemswiththeprincipalhimselfhadtheparentsgonetothemeeting.A.haddiscussedB.coulddiscussC.couldhavediscussedD.woulddiscuss听说虚拟什么的，关键是我连句意都

Question

请问，为什么这道英语题选C
They _____the problems with the principal himself had the parents gone to the meeting.
A. had discussed B. could discuss C.could have discussed D. would discuss
听说虚拟什么的，关键是我连句意都不理解

Answer 1

首先这个是考察if 虚拟语气
对过去的事情进行虚拟（ 从句 If + 主语+ had +过去完成式动词+ ……主句：主语+ would (should,could,might) + have +过去完成式动词+……）
本来是if the parents had gone to the meeting 可以变换成倒装 把引导词if去掉 had提前 就变成had the parents gone to the meeting.
所以这个时候看句子 就知道选择c