问题补充：
The servant did she could the revolutionary.
A. what, help
B. that, to help
C. what, to help
D. all help
答案：
A. what, help
B. that, to help
(答案→)C. what, to help
D. all help
解析： do what one can to do sth. = do all that one can to do sth. 中的不定式表示目的。
