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Not until the teacher explained the importance of getting up early ______ we promise to come early.
A.should B.would C.did D.could
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。
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