The line was busy; someone ________ the telephone.
A.may be usingB.may have usedC.must have been usingD.can be using在线课程C
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The line was busy; someone the telephone.A.may be usingB.may have usedC.must have been usingD.can be
编辑：chaxungu时间：2026-04-24 12:58:33分类：高中英语题库
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