Mr.Columbus was always ready to help others. ，he was liked by everyone.
A. In conclusion
B. In return
C. In turn
D. In particular
网友回答
A. In conclusion
(答案→)B. In return
C. In turn
D. In particular
解析：
in return作为回报，作为报答。句意为：Columbus先生总是乐于助人，作为回报，大家都喜欢他。in conclusion 最后；in turn轮流；in particular尤其。