Mr Brown had __ second child last year.But there was somethi

Mr Brown had __ second child last year.But there was something wrong with __ child.
A.the,the B.a,the

选择B
前面a second child表示又生了一个孩子（并且是第二个的意思）
后面是特指,这个孩子有点问题
所以选择B