The English play __________ my students acted at the New Year’s party was a great successA.for whichB.at whichC.in whichD.on which
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C解析根据句子意思需选择介词in，从而构成act in the play。关系代词在此是指English play，指物，因此选择in which。注意：如果定语从句谓语动词为介词动词也就是由动词+介词构成的短语，那么介词必须后置，不能与动词拆开置于关系代词前面。