---How long your parents ?
---For about twenty years.
A. did, marry
B. have, married
C. have, got married
D. have, been married
网友回答
A. did, marry
B. have, married
C. have, got married
(答案→)D. have, been married
解析：根据下文下文“For about twenty years.”来选择动词的延续性，故选D