How long has it been since this company was established?since this company was established?是表语从句?

How long has it been since.这是什麼用法 意思 it has long been assumed Which is correct.Please explain it.1)How long has it been since this company was established?2)How long has the company been established? How long has the movie been on It ___ five minutes _____. how long has it been since you have had this engine tuned ?麻烦人工翻译一下 英语翻译“how long it has been since i have done something 最好结合情景举个例 how long has the game it been since the game of basketball was invented? 翻译 how long has it been since I have seen one!是感叹句吗 How can you possible miss the news?It[ has been] on TV all day long.为什么? 是how long has she been learning…还是how long has been she learning… it has long been known that 1.Do you know ______that bridge is and _____ it has been on the river?A.how long;how far B.how far1.Do you know ______that bridge is and _____ it has been on the river?A.how long;how far B.how far; how often C.how soon;how old D.how long:how long How can you possibly miss the news It ________on TV all day long.为什么用has been 不用had been How long is it since he () his hometown?He () for nearly 10 years.A left;left Bhas left ;has leftChas left ;has been left Dleft ;has been left 为什么是How long has he been there 而不是How long has he gone there How long has it been since they were here?Few hours now.这个怎么翻译~How long has it been since they were here?Few hours now.两句话~ How long has it been since this company was established?since this company was established?是表语从句? 翻译How long has this food store been in business?