When a hand, one should say “Thank you” or “It’s very kind of you.”
A. offered
B. to offer
C. to be offered
D. offering
网友回答
(答案→)A. offered
B. to offer
C. to be offered
D. offering
解析：考查状语从句的省略句：当主从句的主语一致的情况，可以省略从句的主语和be动词，when offered=when one is offered。句意：当被提供帮助的时候，人们应该说“Thank you”或“It’s very kind of you.”选A。