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_________has helped to save the drowing girl is worth praisi

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_________has helped to save the drowing girl is worth praising.
A.No matter who B.Whoever
为什么选B不选A
_________has helped to save the drowing girl is worth praisi
请参考 例句2
whoever 和no matter who 都是无论谁,不管谁的意思.
但whoever可以作为引导让步状语从句的连接代词,而no matter who 不能.
whoever和no matter who 是疑问词 + ever和no matter + 疑问词中的一个特例,这类词的主要区别是:
①疑问词 + ever可引导名词性从句,在主从句中要充当一定的部分.如:
Whoever breaks the rule must be punished.You can choose whatever you like in the shop.
②疑问词 + ever还可引导让步状语从句.如:Whoever breaks the rule,he must be punished,Whatever you do,you must do it well.
③no matter + 疑问词只能引导让步状语从句.如:No matter what you do,you must do it well.No matter who breaks the rule,he must be punished.