The radio set last week has been out of orderA.I bought B.I bough_英语解答

The radio set last week has been out of order
A.I bought B.I bought it C.which I bought it D.what I bought

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解答

定语从句修饰radio set （收音机,作宾语）关系词which可省略
it 不能有,重复了
选A