scientists say it may be five or six years before it is poss

来源：学生作业帮编辑：拍题作业网作业帮分类：英语作业时间：2024/04/30 02:24:36

scientists say it may be five or six years before it is possible to test this medicine on human patients科学家对药品先要进行反复试验后才能用于病人身上这里的before为什么提前?为什么不直接说it is possible to test this medicine before on human patients?

后面的it is.是一个从句,befor而后面省略了一个that
原句是.before (that)it is.

scientists say it may be five or six years before it is poss 非诚勿扰Scientists say it may be five or six years ______ it is Scientists say it may be five or six years ____ it is possib scientists say it may be five or six years____it is possible 英语翻译Scientists say it may be five or ten years ______ it is Scientists say it may be ten years _____ this medicine was p Scientists say it may be a fe years___it is possible to test Scientists say it may be a few years___it is possible to tes It may be five years ( ) it is possible to test this medicin it will be five years before we meet again it may be 5 or 10 years away.( ）一道初三英语单选Scientist say it may be a few years ____ it is possi