题目描述:
This everything will be the twenty-ninth time we _ the experiment.A.will do B.have done C.didD.are to do
答案解析
【答案】【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. 【其他答案】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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