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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