介词 by和acrossIf you really have to leave during the meeting,you had better leave _______ the back door.为什么不用across?

介词 by和acrossIf you really have to leave during the meeting,you had better leave _______ the back door.为什么不用across? After you enter the park by the main gate.这句介词为什么用by? by是介词吗? What do you mean by saying so?What do you mean by/of saying so?应该用哪个介词,为什么? Can you jump ___me?介词填空.介词有in of at about with like by from for 英语语法问题,I may kill you with my singing!中的介词with用的对吗?介词by可以吗? by和take的区别除了take是动词,by是介词以外 You should have your eyes ___ by a doctor填介词 You should cross the road ( ) the crossroads.填介词为什么不用“with”或是“by”呢？ 关于介词with 和by 的区别with 和by 都可以表示方式吗?有什么区别?它们作为介词时都有哪些用法? BY 介词中怎么用 英语介词：by + 时间名词 by morning by sunset by tomorrow by friday例句是：i hope you can get this done by morning..这句子该如何理解 我理解成是到早上之“前 英语翻译例如i'm sorry you feel smothered by our relationship 和for和with还有其他原因类介词的用法区别,不要复制否则不给分 英语中介词with和by的用法区别我老弄混 用wave good-by 和wave a greeting 造句 对某人挥手打招呼介词是什么? by you 为什么where do you live和who do you live with第一句句末不加介词,第二句句末要加介词with? I will time you ( ) my watch.括号里应该填哪个介词 A.of B.in C.by D.on