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

a serious problem. [ ]

A. That

B. What

C. Despite what

D. Though what

下列哪种疾病进行诊刮是无助的（）

A.子宫内膜癌

B.闭经

C.子宫内膜异位症

D.无排卵型功血

E.子宫内膜结核