He is always helping people without expecting anything .A. in common B. in turnC. in dange

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A. in mon
B. in turn
C. in danger
(答案→)D. in return
解析：句意：他总是愿意帮助别人不盼望别人的回报。in mon共有的，共同的；in turn依次；in danger处于危险中；in return作为回报。根据句意故选D。