(8分)Here is an experiment (实验) to see how ants can organize some clever teamwork. What's going on...

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perform be performing have performed be performed

had done; didn’t finish was doing; hasn’t finished did; wouldn’t finish did; hadn’t finished

had done; didn't finish was doing; hasn't finished did; wouldn't finish did; hadn't finished

排除法恒定法匹配法随机化法

had done; didn’t finish was doing; hasn’t finished did; wouldn’t finish was doing; hadn’t finished

experiment explore expose expand 第二节完形填空：（共20小题, 每小题1分, 满分20分）

had done ; didn’t finish    was doing ; hasn’t finished
   did ; wouldn’t finish    has done ; hadn’t finished

had done ; didn’t finish was doing ; hasn’t finished did ; wouldn’t finish did; hadn’t finished

had done ; didn’t finish was doing ; hasn’t finished did ; wouldn’t finish has done ; hadn’t finished

8因子的全因子实验 8因子的部分因子实验中心复合设计（CC Box-Behnken设计

had done ; didn’t finish was doing ; hasn’t finished did ; wouldn’t finish hadn’t finished

had done; didn’t finish was doing; hasn’t finished did; wouldn’t finish has done; hadn’t finished