How long______each other when they got married?

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问题 How long______each other when they got married?

选项 A、had they known
B、have they known
C、would they know
D、did they know

答案A

解析结婚的事情已经发生。是过去时，到他们结婚时认识了多久应用完成时，而他们的结识是在结婚前。所以，应用过去完成时。选项A是正确的。句子大意：他们结婚时彼此认识多久了?

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