The manager was very angry，for he had sent his business partner two thousand machines yesterdy，half of unqualified．
A.whom
B.what
C.them
D.which
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C解析考查人称代词作独立主格的逻辑主语。句意：经理非常生气，因为他已发给他商业伙伴两千台机器，其中一半有质量问题。half of unqualified．是独立主格结构，half of 是unqualified的逻辑主语，of是介词，所以此处要用宾格。