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Themanagerwasveryangry,forhehadsenthisbusinesspartnertwothousandmachinesyesterday,halfof()unqualified.答案是them为什么不能是which

题目详情
The manager was very angry ,for he had sent his business partner two thousand machines yesterday ,half of ( )unqualified .
答案是them 为什么不能是which
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答案和解析
unqualified是后置定语,用which 后面至少是个句子