Last month Lucy went to New York to bisit her friend Lily

问题补充：

如上

答案：

Lucy has gone to New York to visit her friend Lily. -- 现在完成时，描述她（在今日以前）已去过。

Last month, Lucy had gone to New York to visit her friend Lily. -- 过去完成时，描述她 上个月以前 就已去过。