题目内容
【题目】Not until he retired from teaching three years ago having a holiday abroad.
A. he considered B. he was considered
C. had he considered D. did he consider
【答案】D
【解析】D。解析:Not until位于句首,句子要用半倒装结构,排除AB,句子描述的是过去发生的事情,故用一般过去时。
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