has recently been done to provide more buses for the people a shortage of public vehicle

问题补充：

has recently been done to provide more buses for the people, a shortage of public vehicles remains a serious problem.

A. That

B. What

(答案)C. Despite what

D. Though what

答案：

@@A. That@@B. What@@(答案)C. Despite what@@D. Though what

解析：本题句意“尽管最近已采取的措施为人们提供更多的公共汽车，公共运输车辆的短缺仍是一个严重的问题”。分析句子可知，因为没有连词，故逗号前不是一个完整的句子，其中缺少has been done的主语，故用what。what引导的名称性从句作despite= in spite of的宾语。