有关宾语从句的几题___has recently been done to improve the taxi servi

有关宾语从句的几题
___has recently been done to improve the taxi service,we still get a lot of complaints about it .
A In spite of what
B Even what
C Though it
D That
You may borrow as many books as you like,so long as you show them to ___is at the desk
A whoever
B who
C whom
D which