填空题 If one does not pick up {{U}}his{{/U}} dry-cleaning {{U}}within{{/U}} thirty days, the management is not {{U}}obligated{{/U}} to return it {{U}}back{{/U}}. A. his B. within C. obligated D. back
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【正确答案】 1、D应将back删掉。    
【答案解析】[解析] return本身就是“返回”的意思。