and was tied up with work when I came backtied

问题描述:

and was tied up with work when I came back
tied

tie up的含义有以下几个:
(1)To keep occupied; engage:
使保持忙碌;从事:
She was tied up in a meeting all morning. The phone was tied up for an hour.
她整个上午都在开会。电话忙了一个小时
(2) 束紧,缚牢:固定或被固定到海岸或码头上;停泊
(3)阻碍…的进展;阻塞:
The accident tied up traffic.事故阻塞了交通
在本句中,我们可以把be tied up with sth看成固定短语,意思是“忙着做某事”。

被...绑住了
我理解在这句话中是指被工作缠身

因为工作的缘故,我回来的时候真是太累了.
这里是“疲劳,疲倦”的意思;与...密切联系;忙於
1. 系住
He tied up the horse and went into the inn.
他系住马,走进了小酒店.
2. 使受阻
The traffic had been tied up for three hours.
交通阻塞已有三个小时.