while after before whenScientists say it may be five or six years___it is possible to test the medicine on human patientsA while B after C before D when最好能把句子翻译一下

when,while,before,after+________ before after when and while的用法 while,when,until,after,before,as soon as 怎么用? when,until,after,while,before,because个造一个句子 as soon as,when,while,before,after,until引导的时间状语从句的用法 when,while,as soon as,before,after的区别从句与主句各是什么时态 after,while,before.的意思与区别区别是什么 哈哈 如果可以的话 如果句子里有 when before while after这些词语都是时间状语吗 He asked --------- they needed some more bananas A.after B.before C.whether D.while I arrived at the airport ________(after/while/when/before))the planehad taken off Thiety years had passed----- he kenw itA.after B.when C.before D.while I saw an accideng_____i was walking in the street.------中选 while before after until let's tal;k about it again ---------- we make a final decision (before ,after ,while ,when) Please have a wash_____(1,after 2,while 3,till 4,before) you go to bed The cat often lies on the sofa___I watch TV after supper A.before B.so C.while D.after soon after,after a while 和 before long 三个的区别是什么?分别怎么用?后面怎么跟? After school he ran home,（ ）his mother was cooking in the kitchenA after B while C before D during after a while=?