good use you have made of your time to work, there is still some room for improvement.
A. Whatever
B. However
C. Though
D. Whether
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(答案→)A. Whatever
B. However
C. Though
D. Whether
解析：考查让步状语从句。句中good use放在一起是一个名词，用whatever修饰。句意：不管你怎么很好得利用你的时间去工作，还是有提升的空间。