His mind had already cracked with thirst.1. 教材上说的是cracked with表示因....而疯狂,是不是根据时态的需要,可以不用crack的过去时态。2. with, at, for, over 介词都可以表示心里精神方面的原因,老师可以分析下各有什么侧重点和区别吗?
Americans will generally do business with the company they think gives them the highest value for the lowest price, not based on personal relationships.此句应该是两个句子,在they前面是不是应该用逗号隔开呢?