_____scores of times,but he still couldn't understand it.A.Having explainedB.Having been explainedC.Though it was explainedD.It was explained为什么不选B呢?
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![_____scores of times,but he still couldn't understand it.A.Having explainedB.Having been explainedC.Though it was explainedD.It was explained为什么不选B呢?](/uploads/image/z/9156031-7-1.jpg?t=_____scores+of+times%2Cbut+he+still+couldn%27t+understand+it.A.Having+explainedB.Having+been+explainedC.Though+it+was+explainedD.It+was+explained%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E9%80%89B%E5%91%A2%3F)
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