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
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
D
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)。