--Where ______ the recorder? I can't see it anywhere.--I ______ it right here, but now it's gone.A.did you put; have putB.have you put; putC.have you put; have putD.did you put; putting
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B解析根据 I can't see it 得出第一个空应用完成时，而第二句中的 now it's gone表明前面的事发生在过去。