My father's little library consisted chiefly of books in polemic divinity, most of which I read, and have since regretted that, at a time when I had such a thirst for knowledge, more proper books had not fallen in my way, since it was now resolved I should not be a clergyman.

老师这句话中的and have since regretted 和什么并列，如果它的主语是I的话那怎么能连在most of which后面呢？

【答】逻辑判断即可解决：have regretted 这个动作只能由“人”完成，所以，前文的library 和 books 是无法做到的，只有“I”。而 “I” 是定语从句的主语，那么 have since regretted 和 read 并列，而且也是定语从句的一部分。副词 since 表示“从阅读那些书之后/以来”。

还有since it was now 的 now 翻译的时候为什么翻译成既然当时我已经决定不再当牧师了？

【答】now 可以表示那个时候的“现在”，自然翻译成“当时”，查词典便知。