I will have left for America by the time he arrives这句怎么翻译?

I will have left for America by the time he arrives这句怎么翻译? My parents have promised to come to see me before I -----for Africa.A.have left B.leave C .left D.will leave My parents have promised to come to see me before I _________ for Africa.A.have left B.leave C.left D.will leave I have called the station and they told me the next train for Da lian _at 3:10A.will leave B.left C.has left D.leaves I have called the airport and they told me thenext flight for London（ ）at 2:30.A.will leave .B.left.C.has left.D.leaves I will go as ill as I do now for a very long time的意思上句是you have left the light on will go是最佳答案 56.By the time you get to Beijing tomorrow,I ________ for Shanghai.A) am leavingB) should have leftC) will leaveD) have already left When __you___the house?I have been away for half an hour.A.were leaving B.have left C.did leave D.will leave选什么,并说明理由. Since he left after I have been looking for living. I have left for three hours.有无语法错误? I have left my schoolbag in the room.---Don`t worry.I will ___ it for you .A.bring B.get C.take为什么原因 问两个时间状语的句子After dinner we waited for the concert to begin为什么不用waitBy the time you read this,I have left.为什么不是 I will leave或者I had left? 一道困扰了很久的单项选择题!By the time you get to Beijing tomorrow,I ________ for Shanghai.A) am leaving B) should have left C) will leave D) have already left 为什么不选其他的? -Mr.wang ,i have a question to ask you.-be quick,i ( ) for an important meeting.A.will leaveB.am leavingC.have left D.will go为什么要选择B, By the time you get to Beijing tomorrow,I ____2____ for Shanghai.By the time you get to Beijingtomorrow,I ____2____ for Shanghai.A) am leavingB) should have leftC) will leaveD) have already left（B）为什么D不可以? I have been working in this factory for about 20 years and seldom []so tired as now选择 A I have left B I had left C have I left D had I left if i have chance i will look for if i have chance i will look for