C

题目分析：考查过去分词做宾语补足语：句意：布朗太太看到她修好的洗衣机又坏了很失望。该题考查的是“have sth. done”结构。题干中的 the washing machine went wrong 为 see 后的宾语从句，she had had (the washing machine) repaired 为 the washing machine 所带的定语从句；定语从句谓语含have sth. done 结构，为过去完成时。因先行词the washing machine 在句中作 had 的宾语，故关系代词 that 或 which 被省掉。故答案为 C.