单选题 If one does not pick up (his) dry-cleaning (within) thirty days, the management is not (obligated) to return it (back).
【正确答案】 D
【答案解析】删去back，因为return已包括还“回”之意。类似的词还有repeat，该词后不该跟again，因为语意重叠。例如，Please repeat！即可。