I have long since forgotten what we quarrelled about last time we met.
long since:
ad.很久以前(早已,久已)
例句與用法:
1.Long ago; long since.
很久以前；往昔
2.His study is a chaos:his house keeper has long since given up trying to put his papers in order.
他的書房亂七八糟,他的管家早已放棄為他整理文件了.
3.It has long since been satisfactorily established that a high executive does not have a large vocabulary merely because of the opportunities of his position.
長期以來人們就有呈個想當(dāng)然的看法：高級行政管理人員不會有很大的詞匯量,因為處不那個位置上,他有的是機會.
4.He has long since been recognized as a great playwright.
他早就被公認為偉大的劇作家了.