Mrs.Smith was much disappointed to find the washing machine she had had went wrong again.
A.it B.repaired
C.it repaired C.to be repaired
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解析：考查定语从句以及have的用法,the washing machine是先行词,在从句中应作第二个had的宾语,关系代词that省略。还原成She had had the washing machine repaired,即have的过去完成时以及复合宾语形式,repair与washing machine之间是被动关系,故用repaired。