After school was over the boys their books and went home.A. put inB. put asideC. put away

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A. put in
B. put aside
(答案→)C. put away
D. put up
解析：短语辨析。put in 提出，放入； put aside 撇开；  put away 放好抛弃put up提供，建造。句意：这些男孩子在放学后放好他们的书，回家了。故选C。