2. 外语
  3. Not until three years ago_____to work outside.

Not until three years ago_____to work outside.

admin2015-02-14  72
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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