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发布时间：2020-07-12 11:05:31

________ no need for us to discuss the problem again ________ it has been settled.A.It has ; whenB.It is; becauseC.There has; forD.There is; since

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D解析导解：There be客观存在，“有”必要；第二空用since引出大家已知道的被用作推断的理由的状语从句．
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