问题补充：
My parents twenty years ago. They for twenty years.
A. have been married, got married
B. were married, got married
C. got married, have been married
D. have got married, were married
答案：
A. have been married, got married
B. were married, got married
(答案→)C. got married, have been married
D. have got married, were married
解析：句意：我的父母二十年前结婚了。他们已经结婚有二十年了。分析前文体现为一般过去时（twenty years ago）,下文体为现在完成时，有段时间：for twenty years.故选C
