答案：A
1、A 答案用的是过去完成时,即：had + 过去分词.过去完成时指“一个动作或状态在过去某一时间或动作之前已经发生或完成”,即动作发生的时间是“过去的过去”.后面用的是turned on,决定了答案选A.
2、答案B 用的是现在完成时,其结构是：have/has + 过去分词,现在完成时表示“过去发生并且已经完成的动作对现在造成影响或后果,过去某一时间开始并一直持续到现在的动作或状态”.
翻译：当我打开电视的时候,电视节目已经开始了10分钟.
the tv show__for ten minutes when i turnded on tv A had been
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