问题
选择题
________ had been done, the working efficiency of the employees still remained low.
A．Though
B．Despite the fact that
C．Despite
D．Despite what
答案
答案：D
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。
