Not until the teacher explained the impo...

Not until the teacher explained the importance of getting up early ______ we promise to come early.

A．should

B．would

C．did

D．could

Ｃ【解析】考察倒装句。Not until放在句首时，后面的主句使用部分倒装的形式。后面主句的promise是谓语动词，所以使用助动词did.句意：直到老师届时了早起的重要性的时候，我们才允诺会早点来。

考点分析：

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