This everything will be the twenty-ninth time we _ the experiment.A.will do B.have done C.didD.are to do

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This everything will be the twenty-ninth time we _ the experiment.A.will do B.have done C.didD.are to do
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This everything will be the twenty-ninth time we _ the experiment.A.will do B.have done C.didD.are to do
This everything will be the twenty-ninth time we _ the experiment.A.will do B.have done C.did
D.are to do

This everything will be the twenty-ninth time we _ the experiment.A.will do B.have done C.didD.are to do
【B. have done.】

这次是第29次,那么之前就发生过28次,连同这一次（说话的时候刚完成）,就是说这29次都完成了.故用完成时态.

选B。This everything will be the twenty-ninth time we have done the experiment.这将是我们第29次做这个实验。

everything will “Everything everything will be OK Everything will be Everything will go well! Time will tell everything everything will be okay Everything will be Everything will be fine! Everything will happen. Everything will be free: Everything will sharting . Everything will be okey Everything will be ok Go down this street,you will see,everything is bright 有谁知道意思吗? Everything will be okay ,b hope this can get good grades . I will pay everything for you .I will give my all for changing your love this life.翻译下 Love will show you everything . Love Will Show You Everything