题目

I failed in the final examination last term and only then __ the importance of studies.
A.I realizedx05B.I had realizedx05C.had I realized D.did I realize
为什么不能选A呢?

提问时间：2020-08-07

答案

I failed in the final examination last term and only then __ the importance of studies.A.I realizedx09B.I had realizedx09C.had I realized D.did I realize选D这是一句only引导的状语从句放句首引起的部分...