"in return"与in turn"

题目

"in return"与in turn"
His father died in a car accident.He stayed with his mother till nearly midnight,comforting her and being comforted _____.
A.in public B.in return C.in vain D.in turn
为什么不是B呢?
在词典上查到英文解释了.in return:as a payment or reward (for sth).in turn:one after another;in succession.是我词义没掌握好，

答案

AC你知道不可入选.
B是强调反馈.D是被安慰.
你看第二句,他和他妈妈呆在一起知道半夜,安慰他妈妈,同时被安慰（这里应该意思应该是她妈妈也反过来安慰他）.只有这个说的通.
in turn 转而,反过来,依次 in return 作为回报
回报根本说不通,语境语义均不合适.