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

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A. he had considered
B. had he considered
C. he considered
(答案→)D. did he consider
解析：
试题分析:句意：直到他三年前从教育退休，他才考虑去国外度假。not until结构位于句首时，主句使用部分倒装语序，排除A、C选项，根据three years ago判断句子用一般过去时，答案选D。