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        1. I will mark ______ everything you say.It is helpful to the English learners.
          A.upB.downC.outD.off
          B
          mark up“提高;標記”; mark down“記下”; mark out “劃出(界線、范圍)”;mark off“劃出,劃開;區(qū)分”。由句意可知,B項符合題意。
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