请给分析一下这段英语中两个句子的时间关系,和因果关系.ElizabethnortherntouroftheLakeswasfastapproaching.ButonedayaletterarrivedfromMrs.Gardiner.Shewrotethatherhusband,becauseofabusiness,couldnotleaveunt

Question

请给分析一下这段英语中两个句子的时间关系,和因果关系.
Elizabeth northern tour of the Lakes was fast approaching.But one day a letter arrived from Mrs.Gardiner.She wrote that her husband,because of a business,could not leave until July.This was because he had to be in London again within a month.As this was too short a time for them to go so far,they could only go as far north as Derbyshire.This was where Mrs.Gardiner had grown up,near the town of Lamton.
其中：She wrote that her husband,because of a business,could not leave until July.This was because he had to be in London again within a month.这两句话的时间关系,和因果关系理不顺.

Answer 1

She wrote that her husband,because of a business,could not leave until July.This was because he had to be in London again within a month.
她信中写道,她的丈夫因工作关系,七月之前都不能离开.因为他在一个月内必须再到伦敦一次.
后面一句是因,前面一句是国,this is because 中的this就指的是前一句话