New York is the city __________ she is longing to visit.

选择A
定语从句在句中做定语,通常出现在先行词之后,由关系词（关系代词或关系副词）引出.关系代词有：who, whom, whose, that, which等.关系副词where的含义相当于"介词+ which"结构,因此常常和"介词+ which"结构交替使用,例如：
Beijing is the place where (in which) I was born. 北京是我的出生地.