i must apologize for not letting you know earlier为什么这里是 letting而不是let啊?

I must apologize for my mistake这 I must apologize for my behavior yesterday.怎么回答 BUT I WANT I MUST I DO APOLOGIZE FOR ALL THAT I'VE DONE I must apologize for interrupting you.可以改为“I must apologize for having interrupted you.这里的having interrupted是什么时态,这个用法是怎么回事呢? I must apologize for not letting you know ahead of time.请翻译一下, I must apologize for not letting you know earlier的中文意思是什么? i must apologize for not letting you know earlier为什么这里是 letting而不是let啊? i must apologize for any inconvenience caused这个caused在这里的词性 语法? 英语翻译I must apologize for not letting you know ahead of time. After looking at his watch,he hurried to the station.Or:After having looked at his watch,he hurried to the station.第2句为什么可以用having替换I must apologize.I interrupted you.I must apologize for interrupting you.I must apologize for havi 翻译I apologize for my belated reply 英语apologize for 用法I must apologize for()ahead of time.---that's all right.A.letting you not know B.not letting you know C.letting you know not D.letting not you know 选什么以及为什么? I must apologize for not letting you know earlier. 句子成分分析,另外为什么know不用非谓语形态,是做谓语? .I must apologize for not_____you know the result earlier.A.let B.to let C.letting 知道怎么做的告诉下,要理由 You shouldn't be so rude to a lady,young man,----,I think,you must apologize.A.whom B.whichC.to her D.for which I apologize to her for being late.有没有语法错误? 【高二英语】I must apologize for ____ ahead of time.( ) A.letting you not know B.not letting you...I must apologize for ____ ahead of time.( )A.letting you not know B.not letting you know C.letting you know not D.letting not you know I must apologize for having you waiting for so long.一到翻译题的答案为什么是waiting for so long?不是直接可以waiting so long吗?加for的话就不对了吧