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

问题补充：

He is always helping people without expecting anything .

A. in common

B. in turn

C. in danger

D. in return

答案：

A. in common

B. in turn

C. in danger

(答案→)D. in return

解析：A. in common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。