When ______ help, one often says "Thank you" or "It’s kind of you".

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问题 When ______ help, one often says "Thank you" or "It’s kind of you".

选项 A、offering
B、to offer
C、to be offered
D、offered

答案D

解析 当状语从句的主语和主句的主语一致,且在谓语中含有be时,可省略主语和动词be,根据题意可知从句的主语和主句的一致,并且和从句的谓语动词是被动关系,因此可知When后面省略了one is。
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