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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Thiseverythingwillbethetwenty-ninthtimewe_theexperiment.A.willdoB.havedoneC.didD.aretodoThiseverythi

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。

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