【题目】Not until he retired from teaching two years ago _______ having a holiday abroad.
A. he had considered B. had he considered
C. did he consider D. he considered
在线课程【答案】C
【解析】
考查部分倒装。句意：直到他两年前从教育退休，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、D选项，根据three years ago判断句子用一般过去时，答案选C。