had been done, the working efficiency of the employees still remained low.
A. Though
B. Despite the fact that
C. Despite
D. Despite what
网友回答
A. Though
B. Despite the fact that
C. Despite
(答案→)D. Despite what
解析：本题考查介词用法。despite是介词，不是连词，所以不能后接句子，what had been done为名词性从句。Though后接句子。选D。