Backpacks are convenient because A.they can be very large. B.they can hold as many things as you want to carry. C.your hand sare freed to do other things. D.you do not have to carry things with you.
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根据上篇材料和选项回答题:To get a good night's rest,people may not need
根据上篇材料和选项回答题:To get a good night's rest,people may not need to __________.