问题描述：
2012辽宁高考英语一选择题求详解（在线等）
Not until he retired from teaching three years ago having a holiday abord A.he had considered B.had he congsidered C.he considered D.did he consider (要详解,主要是B和D的辨析.
Not until he retired from teaching three years ago having a holiday abord A.he had considered B.had he congsidered C.he considered D.did he consider (要详解,主要是B和D的辨析.
问题解答：
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