---------farthers made them have piano lessons.

问题描述:

---------farthers made them have piano lessons.
A.Peter and Ann's B.Peter's and Ann's C.Peter's and Ann D.Peter and Ann

答案选B
A's and B's +复数 各自的.
A and B's +单数 ,共同的.
farthers 说明不是共同的父亲