Not until this term ______ to realize how important this subject is to his future career as a diplomat.

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问题 Not until this term ______ to realize how important this subject is to his future career as a diplomat.

选项 A、he began
B、did he begin
C、he has begun
D、that he has begun

答案B

解析表示否定的副词前置于句首，句子需要不完全倒装，即助动词提前。其余选项均可排除。除Not until外还有never，seldom，rarely，seldom，no，little，hardly，in no time等否定副词或结构放在句首时，句子需要部分倒装。

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