The doctor checked up Mike's ________ hearts.

问题描述:

The doctor checked up Mike's ________ hearts.
A.mother in law's and his brother in law's  
B.mother's in law and his brother's in law  
C.mother in law and his brother in law's
D.mother in law and brother in law's
为什么选A

名词 n.
1.姻亲
表示所有格 in law's