He received a letter a few days ago and not till then_____that he had won a scholarship.

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问题 He received a letter a few days ago and not till then_____that he had won a scholarship.

选项 A、did he learn
B、he learnt
C、does he learn
D、did he learnt

答案A

解析语法类试题(副词短语)。not till then在这里要引导一个倒装句，而句子时态是过去时。所以选A。

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