He has many good qualities, ________ generosity(慷慨大方)is not the best．A.in whichB.from whichC.with whichD.of which
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D解析本题考查定语从句中的“介词+关系代词”的用法。“他有好多优秀品质，但是慷慨大方不是他这些优秀品质中最好的”，考查的是定语从句中对句型的正确理解，即：Generosity is not the best of all the good qualities．，所以用of which。