When she was alone at home，Mary needed a friend .A. playing withB. having played withC.

When she was alone at home，Mary needed a friend .
A. playing with
B. having played with
C. with whom to play with
D. with whom to play

A. playing withB. having played withC. with whom to play with(答案→)D. with whom to play解析：with whom to play为“介词+关系代词+不定式”结构在句中作定语,其相当于一个定语从句(with whom she could play)。

这个问题的回答的对