题目内容：

Being a parent is not always easy ,and being the parents of a child with special needs often carries with ___extra stress

优质解答

当父母并不总是很容易的,而且作为一个有着特殊需要的孩子的父母经常附加有更多的压力.
it指代前一句中的being the parents of a child with special needs .