could do 还是 could to doThe doctor did what he could ——————————the dying man A save B to save C saved D saving
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could do 还是 could to doThe doctor did what he could ——————————the dying man A save B to save C saved D saving
could do 还是 could to do
The doctor did what he could ——————————the dying man
A save B to save C saved D saving
could do 还是 could to doThe doctor did what he could ——————————the dying man A save B to save C saved D saving
答案是B
could是情态动词 情态动词后面要跟动词原形 情态动词还包括了 will can should shall may might 等 但是这句话里 could是 从句what he could 里的 意思是 这位医生做了他所能做的去救这个将要死去的人.to save 是表目的 do sth to.
选B，医生做了他能做的为了这个救濒临死亡的人，to 表示目的
B to save
医生尽其全力去救这个快死的人.
do what he could to
尽其全力去......
情态动词后用动词原型
但这里could并不是直接与动词相连,
而是在从句中what he could 其所能
你好，回答如下
B 选择to save
不妨看做what后面+do 还是to do的不定式
而不是你说的could do 还是could to do
因为could 后面一定是接do的
而what疑问代词一般后面都是接to do的
could do !!
could永远不能与不定式连用！！
你这个句子，what he could 是插入成分，做题时应该去掉