If a task once begunNever leave it till it's doneBe the labor great or smallDo it well or not at all

If a task once begunNever leave it till it's doneBe the labor great or smallDo it well or not at all The research is so designed that once _______nothing can be done to change it.A. begins B. having begun C. beginning D. begun求详解.waiting The reserch is so designed that once ___ nothing can be done to change it.A.begins B.having begun C.beginning D.begun 为什么选D? The research is so designed that once ________ nothing can be done to change it.A.begins B.having begun C.beginning D.begun The research is so designed that once ___ nothing can be done to change it.A.begins B.having begun C.beginning D.begun(答案是D,为什么?) According to the rule,once ,the research plan cannot be changed.A begin B beginsC having begun Dbeginning为什么 this is a task a task英文读音 If you finsh these task,you can go to a moves tonight同义句（ ）these task，（ ）you can go to a movie tonight. A.When B.If C.While D.Once 为什么? 求详解once begun还是once beginning?The research is so designed that once begun,nothing can be done to change it.我知道此处是省略了once (it is )begun,但once beginning The research is so designed that once ____ nothingcan be done to change it.A.begins B.havingbegun C.beginning D.begun要怎么选 The research is so designed that once _______ nothing can be done to change it.A.begins B.having begunC.beginning D.begun task 这个by-passed once the brain gets familiar with a certain linguistic task,the processing route which was used to learn it will be by-passed. if you can finish the task s_______ in three days,you can get a big prize.填一个词, The research is so designed that once begun nothing can be done to change it.The research is so designed that once begun nothing can be done to change it.为什么是once begun 为什么不是once begin.once negun=once itis begun那算被动语态了 once a