Tom and his two brothers are ____ (both,all)from Austrilia.

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Tom and his two brothers are ____ (both,all)from Austrilia.
Tom and his two brothers are ____ (both,all)from Austrilia.

Tom and his two brothers are ____ (both,all)from Austrilia.
all 三者用all 两者用both 这里是三者,故用all

both
两个人都…… 要用both