I hope that the little I have been able to do does good to them all. A. whichB. whatC. th

问题补充：

I hope that the little I have been able to do does good to them all.

A. which

B. what

C. that

D. when

答案：

A. which

B. what

(答案→)C. that

D. when

解析：因为当先行词是表示事物的all, little, few, much, anything, everything, nothing等时，多用that引导定语从句。