问题补充:
The doctor did save the patient’s life.
A. that he could do
B. all what he could
C. all he could to
D. which he could
答案:
A. that he could do
B. all what he could
(答案→)C. all he could to
D. which he could
解析:考查省略句和不定式做目的状语:句意:医生尽了最大努力救病人的生命。All是这句话的宾语,he could是定语从句修饰all,定语从句省略了关系代词和动词do,不定式这里是目的状语,选C。