问题补充：
- When did your parents ? - They for 20 years.
A. marry.; got married
B. get married; have got married:
C. marry; have got married
D. get married; have been married
答案：
A. marry.; got married
B. get married; have got married:
C. marry; have got married
(答案→)D. get married; have been married
解析：句意：你的父母是什么时候结婚的？他们结婚有20多年了。get married固定词组结婚，have been married for+一段时间表示结婚多长时间了，根据句意，故选D。
