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【单选题】
原发性不孕的定义是A.
夫妇同居，性生活正常，不避孕，1年未孕者
B.
夫妇同居，性生活正常，不避孕，2年未孕者
C.
夫妇同居，性生活正常，虽第一次婚姻曾生育，此后未避孕2年未孕者
D.
夫妇同居后一年未孕，一方有无法纠正的解剖生理缺陷者
E.
夫妇同居，性生活正常，虽第一次婚姻曾生育，此后未避孕1年未孕者
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