the experiment___,they decided to go on holiday for a week.A.to be finished B.having been finished

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• the experiment___,they decided to go on holiday for a week.A.to be finished B.having been finished答案B,为什么?谢谢
• the experiment___,they decided to go on holiday for a week.A.to be finished B.having been finished
• 这道题是这样的;将2008减去它的二分之一,再减去余下三分之一,再减去余下四分之一,以此类推知道最后减去余下的二零零八分之一,求结果
• ∫ (x-2)/ ((x+1)^2+4) dx