When their first child was born they for three years.A. had marriedB. had been marriedC.

问题补充：

When their first child was born, they for three years.

A. had married

B. had been married

C. got married

D. had got married

答案：

A. had married

(答案→)B. had been married

C. got married

D. had got married

解析：考查语态。句意：当他们第一个孩子出生时，他们已经结婚三年了。可知句子描述的是孩子出生前已完成的动作，故用过去完成时态。瞬间动词不能和表示一段时间的时间状语连用，需要改为被动语态，故选B。