I_Mr.Smith since he moved to Shanghai.选哪一个,求讲解!A.didn"t hear fromB.don"t hear fromC.won"t hear fromD.haven"t heard from老师讲有since时就用现在完成时,since后不是应该加时间段或延续性的话吗?可是这个句子的

I_Mr.Smith since he moved to Shanghai.选哪一个,求讲解!A.didnt hear fromB.dont hear fromC.wont hear fromD.havent heard from老师讲有since时就用现在完成时,since后不是应该加时间段或延续性的话吗?可是这个句子的 Mr Smith has worked in this factory since he ( )to China A.has moved B.moved Mr.Smith has lived in his hometown since hewas born.改为同意句He didn't have lunch and hurried to school.改为同意句! Is Mr.Smith in theoffice?Yes,_he is in charge of the office,he must be there.为什么填since而不是for? Is he Mr.smith 改错 Mr Smith works with a chemical company,but he_ for the industrial fair,since he is on leave.Mr Smith works with a chemical company,but he ______ for the industrial fair,since he is on leave.A.has worked B.worksC.has been workingD.is working这句话 Mr.Smith works in a mobile phone comapy,but he__ for this international meeting,since he is onsince he is on holiday.A.works B.is working C.has worked D.had worked请问选哪个选项,为什么? Mr.Smith works with a mobile company,but he ____for this international meeting,since he is on holiday.A works B is working C has worked D had worked能说明理由最好.这个work with 有这个用法吗? Mr Smith works with an auto company ,but he is working for this industrial exhibition ,since he ison leave .准确翻译(理顺他的几个工作的关系）,帮助我理解为什么答案是is working 高中英语的几个句子改写和语法填空1.原句：Mr.Smith gave up smoking quite a long time ago.He is health now.改写：Mr.Smith is in good health now for ______ ______quite a long time since he _______ _______.2.填适当词语：You mad 短文改错 Dear friends,How time flies!It is two year短文改错Dear friends,How time flies!It is two years since Mr.Smith came to our school.He will leave for London next week.In the past two years,Mr.Smith has worked hard.He was strict with us i 完形填空,John Smith had wanted to be a pilot since he was a child,so when he won the lottery and had a lot of money ,he decided to buy his own plane.Then he 1._____ flying lessons.Unfortunately,he wasn’t a very good student .But at last he 2.__ 英语翻译John Smith had wanted to be a pilot since he was a child ,so when he won the lottery and had a lot of money ,he decided to buy his own plane .Then he took flying lessons .Unfortunately ,he wasn’t a very good student .But at last he pass People thought __necessary to invite Mr Smith to speak at the meetingIt was some time __ we realized the truth(when until since before)Sandy could do nothing but__to his teacher that he was wrong(admit) --_____of Hong Kong has Mr.Smith covered since he came here?---About half of it,I guess.A.How many B.How much C.How far D.How wide选一个 Mr Smith __________ at this school since he ________ Xiamen .A.has been teach,came B.has been teaching,came C.taught,came D.has been teaching,has come I_____ Mr Smith since he moved to Shanghai with his father.A.didn't from B.didn't hear from C won't hear from D.haven't heard from Mr Smith ___ at this school since he ___ to Zhuhai.A:has been taught; came B:has taught; has comeC:has been teaching; has come D:has been teaching; came为什么选D?has been teaching是什么时态?