Not until he retired from teaching three years ago______having a holiday abroad.

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问题 Not until he retired from teaching three years ago______having a holiday abroad.

选项 A、he had considered
B、had he considered
C、he considered
D、did he consider

答案D

解析 Not until置于句首时主句用部分倒装,因为“考虑”发生在“退休”之后,所以时态选择一般过去式。
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