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
考察倒裝句。Not until放在句首時，后面的主句使用部分倒裝的形式。后面主句的promise是謂語動詞，所以使用助動詞did.句意：直到老師屆時了早起的重要性的時候，我們才允諾會早點來。
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