I_________this letter around for days without looking at it. A. carry B. must carry C. have been carrying D. am carryingĐoạn văn58/320I_________this letter around for days without looking at it. carrymust carryhave been carryingam carryingGiải thíchĐáp án C Thì hoàn thành vì có cụm từ “for days”