When a hand one should say “Thank you” or “It’s very kind of you.”A. offeredB. to offerC.

问题补充：

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

答案：

(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。