We should do -- we can -- those endangered animals,A that ,to save .B which save,C that ,save .D what ,to save,选什么呢,为什么啊.

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We should do -- we can -- those endangered animals,A that ,to save .B which save,C that ,save .D what ,to save,选什么呢,为什么啊.

We should do -- we can -- those endangered animals,A that ,to save .B which save,C that ,save .D what ,to save,选什么呢,为什么啊.
We should do -- we can -- those endangered animals,A that ,to save .B which save,
C that ,save .D what ,to save,选什么呢,为什么啊.

We should do -- we can -- those endangered animals,A that ,to save .B which save,C that ,save .D what ,to save,选什么呢,为什么啊.
选择D what ,to save
其实完整的句子为:We should do what we can do to save those endangered animals.
因为what从句-what we can do是作为前面We should do 中do的宾语,因为前面已经出现了一个do,宾语中的do是可以省略的,这是习惯用法,记住就好了,意思是我们应该做我们能做的事情
to save those endangered animals是一个目的状语,意思是为了保护这些濒临灭绝的动物.
有问题沟通

D
do sth. 后面sth.是宾语,用名词性从句作宾语,我们能做的一切事 即all that = what we can
to save 动词不定式表示目的,做一切我们能做的事 去保护濒临的动物

D 因为what引导宾语从句,做do的宾语;而后面的to do 表目的,作状语