Not until he retired from teaching three years ago having a holiday abroad. A. he had cons

问题补充：

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

答案：

A. he had considered

B. had he considered

C. he considered

(答案→)D. did he consider

解析：考察倒装句。Not until引导时间状语，放在句首的时候，后面使用部分倒装的形式，排除AC；根据句意本题使用一般过去时，句意：知道三年前他退休，他才考虑出国度假。