________thesentenceagainandagain,b

发布时间：2020-07-27 15:50:50

________ the sentence again and again, but I still can't understand it.A.Having readB.Having been readC.I have readD.Although I have read

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C解析导解：这是由but连接的一个并列句，but前必须是句子而不能是分词短语或从句．
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