Not until three years ago_____to work outside.A、he beganB、he beginsC、began he

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问题 Not until three years ago_____to work outside.

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

答案 D

解析 not放在句首，否定until状语从句，此时主句要求倒装语序。应将助动词did提前。

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