He’s going to relax with friends once the exams are ________ and he has exciting plans for the summer holidays．A.at the endB.by the endC.in the endD.at an end
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D解析be at an end表示“结束，终结”，符合句意。at the end(of)在(……的)末端；by the end(of)到(……)结束时；in the end最后。