When help, one often says “Thank you.” or “It is kind of you “A. offeringB. to offerC. to

When help, one often says “Thank you.” or “It is kind of you “
A. offering
B. to offer
C. to be offered
D. offered

A. offeringB. to offerC. to be offered(答案→)D. offered解析：考查状语从句的省略式。当主从句的主语一致时，可以省略从句的主语和be动词，when offered=when one is offered….,可以用过去分词作状语，逻辑主语为one，与offer故选为被动关系，句意：当被提供帮助的时候，一个人应该说：“谢谢”或“你真好”。故选D。

谢谢了