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--Can you turn down the radio, please?--_________.
A、Oh,I know
B、I'm sorry,I didn't realize it was that loud
C、I'll keep it down next time
D、Please forgive me
【正确答案】：B
【题目解析】：问句为; 请你把收音机的声音关小一点好吗?只有B，对不起，我不知道声音那么大。 符合题意。