---Most of the students went to the party yesterday. It is a pity you were absent.---I wish I . But I was terribly busy.A.didB.hadC.wereD.would
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B解析考查虚拟语气的用法。Wish的虚拟语气用法为 对现在虚拟用did 对过去虚拟用had done 对将来虚拟用would do ，根据I was terribly busy 可知，该句是对过去虚拟，故选择had done，省略形式为I wish I had.