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英语
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This everything will be the twenty-ninth time we _ the experiment.A.will do B.have done C.did
D.are to do
人气:187 ℃ 时间:2020-06-05 21:38:13
解答
【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.
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