you can arrive in shanghai on time for the fashion show___ y

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you can arrive in shanghai on time for the fashion show___ you don't mind taking the right train.
A provided B unless C though D until
A和B有什么区别

provided [常 that; 表条件] 在…条件下; 倘若,假若,只要 (only if)
I will accompany you (that) I am well enough.只要我身体好,我一定陪伴你.
unless 除非,如果不 (= if…not) I shall go tomorrow unless it rains.我明天就走,除非下雨.、
所以选a
再问：如果选B的话这个句子应该改成什么样

you can arrive in shanghai on time for the fashion show___ y what time ( ) the train ) (arrive) in Shanghai. you can arrive in beijing earlier for the meeting _______you The train may arrive in on time 变祈使句You can't eat in the classroom.You can't arrive late for 1 By the time you arrive in London,we___(stay) in Europe for 1.By the time you arrive in London we _____ in Europe for tw by the time you arrive in london,we ___in europe for two wee By the time you arrive in London,we __in Europe for two week 条件状语从句问题You can arrive in Beijing earlier for the meeting __ 几道语法题You can arrive in Beijing earlier for the meeting ( )yo 反义疑问句——You and jack can't arrive at the airport on time,__?A