She told me that she has already gone to the United States four times before she attended that conference.

A．had already been

B．has already been

C．already went

D．was already going

该图是我国东部某地等高线地形图，某校高中学生在图示地区进行了野外天文、地质、植被、聚落等综合考察活动。读图回答下列问题。

简要分析图中E城镇形成的有利区位条件。