Not until three years ago _______to work overseas.

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问题 Not until three years ago _______to work overseas.

选项 A、he began
B、he begins
C、began he
D、did he begin

答案D

解析 not until置于句首时,主句要求使用部分倒装语序,即将助动词提至主语之前。句子描述的是过去时态,故用did。
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