题目

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：C. 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。菱形的两条对角线长分别是6和8，则菱形的边长为    ．