when ()help,one often says "thank you".A offering B to offer C to be offered D offeredwhy?

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when ()help,one often says

when ()help,one often says "thank you".A offering B to offer C to be offered D offeredwhy?
when ()help,one often says "thank you".A offering B to offer C to be offered D offered
why?

when ()help,one often says "thank you".A offering B to offer C to be offered D offeredwhy?
题意是 当人们得到帮助时,常说“谢谢你”. 首先根据提议只能在C和D中选,因为one是得到帮助,被别人给予的帮助,应当是被动,而to be常常表将要发生的事情,所以只能选原型,因为此处讲的是通常情况.时间状语从句,也就是前面的when offered help与后面的主句中的主语重复,因此在前一句中省略掉了one

答案:D offered
解释;当状语从句的主语和主句主语一致时,可以把从句中的主语省略。