-How long have you been studying in No.2 Middle School? -Less than half a year.-So it will be two years and a half ______you graduate from this school.A.when B.before C.after D.since帮忙分析一下具体原因,谢谢!

How long have you been - -Jack!Have not seen you for long!- - -John!__________A.How are you?B.How time flies. Do you remember____in Paris last year?A.how long have you stayed B.how long did you stayC.how long you stayed D.how long you have stayedDo you remember____in Paris last year?For only three months.A.how long have you stayed B.how long did you stayC.ho how long have you been learning english? How long have you been studying? How long have you been in China? how long have you been dancing today? how long have you studied in this How long have you been there? How long have you live in China How long have you ----(live)here? “How long have you been watching -()have you lived in shanghai?-Since we ()work here.A.When;have found B.How long;found C.When;have found D.How long;have found -Can you tell me_?-Since 1990.A.how long have you become a singer B.how long you have live in tow how long have you done与how long have you been的区别 how long have you been 用法how long have you been ---work?A at B on C in D to请教一下下,改选什么?为什么?急! --__do you have a haircut?--Once a weekA.How long B.How soon C.When D.How often ( )have you been a great volunteer?A.How ohten B.How long C.How far D.Howfar