题目

—I'm afraid Mary isn't in. —Oh well,I'll________later. A.ring back                       B.ring off C.ring up                         D.ring out 答案:A ring back(=phone sb.again)再打电话来;ring off挂断电话;ring up给……打电话;ring out发出响亮而清晰的声音。句意:——恐怕玛丽不在家。——好吧,我晚会儿再打来。
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