The little boy was in danger. The doctors and nurses are doing him.
A. what they can do help
B. everything they can help
C. what they can to help
D. all what to help
网友回答
A. what they can do help
B. everything they can help
(答案→)C. what they can to help
D. all what to help
解析：考查宾语从句和不定式做目的状语，句意是：小男孩有危险，医生护士在极尽所能的帮助他。What引导的宾语从句，宾语从句中的动词do被省略了，to help是目的状语，选C。