Charles did what he could ---the servant ,although he himself was in danger.A rescueB.to rescued选哪个?

Charles did what he could ---the servant ,although he himself was in danger.A rescueB.to rescued选哪个?
Charles did what he could ---the servant ,although he himself was in danger.A rescueB.to rescued
选哪个?

Charles did what he could ---the servant ,although he himself was in danger.A rescueB.to rescued选哪个?
选A
若有to rescue 我选它
B 必然不对 to 后面加原型

都不对。
应该是to rescue为什么选to rescue，情态动词后不应该加原形吗？是因为省略了do吗？可以省吗？你的选项里没有to rescue，A是rescue，B是to rescued，都错了。
这句是do sth to 的形式what he could 是一个名词性从句，相当于sth那请问这个从句是宾语从句吗？谢谢你...

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都不对。
应该是to rescue

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