this was a time when being a single _____was still considered unusual

题目

this was a time when being a single _____was still considered unusual
A.man
B.family
C.parent
D.child
这里为什么要选C呢.
我们不是 一般都说 单亲家庭
那是不是单身 母亲 或者是 单身 父亲都 是 a single parent呢。

答案

a single parent单身母亲,这句话是去年北京市中考的完型的第一个空,要根据上下文去填