He is always helping people without expecting anything . A. in commonB. in turnC. in dang

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A. in mon
B. in turn
C. in danger
(答案→)D. in return
解析：A. in mon共同的，B. in turn 轮流，反之，C. in danger处于危险中，D. in return做为回报，句意：他总是帮助别人不图回报，所以选D。