Not until he retired from teaching three years ago（ ）having a holiday abroad。
A、he had considered B、had he considered C、he considered D、did he consider。选择哪一个，说明理由
D
not until放在句首主句要倒装，排除AC。主句常用终止性动词（桐数即非延续性），表示until /till所表示的局配首时间卖穗一到，该动作就发生。所以排除B
选D. not until 引导链大从句，主句携困倒装辩唤念，从句不倒装。three years ago,过去式所以选D.
B