---Please clean the blackboard when class is over, Tom．---________．---Clean the blackboard when class is over, Tom．A.Please say againB.Please say it clearlyC.I beg your pardonD.I don’t understand you
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C解析I beg your pardon(或者beg your pardon)常用于没有听清对方的话，对不起，请再说一遍。而A、B和D项属于汉语说法。