susan arrived here a week 空格,and has been here ever 空格.a.befor;ago b.befor;since c.ago;befor d.ago;since 选一个

susan arrived here a week 空格,and has been here ever 空格.a.befor;ago b.befor;since c.ago;befor d.ago;since 选一个 i was a bit nervous before i arrived here -how long will Susan stay here -Two ____weeks A、many B、muchC、moreD、most We ____ here two hours ago.We ____ here for two hours.A.have arrived;have beenB.have come;have beenC.came;have come D.arrived;have been How come Susan hasn't arrived here yet?She had.Her key at home and went back for it just nowA.Missed.B.lost.C.forgotten.D.left为什么选d,不能是c they arrived here ()sinse a week agoa week ago for a weeknext week I was a bit nervous before I arrived here怎么改句子,使句义不变 It has been a week since we arrived here.(语法点有哪些) how long do you think it is _____he arrived here?a.before b.since I've () here for more than thirty years.A.worked B.arrived C.come D.learned i have just arrived here 句中arrived 是什么词性 susan Mr.Smith's plane___.Let's wait for him here.A.hasn't arrived B.didn't arrive C.doesn't arriveD.couldn't arrive susan is a little g( Have you been here for a long time?No,I ________here just now.A.have arrived B.arrived in C.arrived 顺便说一下我在学现在完成时 还有理由 为什么啊··· They ____ here for more than a month.A.have arrived B.have reached C.have come D.have been Susan:Where are you going ,David?David:To Beijing?Susan:It’s a long trip from here by bike.How long will it take you to (51)c_________it?David:About two years. How long do you suppose it is _____ he arrived here?“How long do you suppose it is _____ he arrived here?”“No more than half a week.”A.when B.before C.after D.sincewhich one/ why?