How long__?Do you know?A have they married B have they got married C have they been marriedD have they been married to

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How long__?Do you know?A have they married B have they got married C have they been married
D have they been married to

C
how long 是一个时间段,所以要用状态

C have they been married,强调结婚这个状态持续了多久