________ has recently been done to provide more English books for the students, a shortage of reading materials remains a serious problem．

1. A.
   What
2. B.
   Though what
3. C.
   In spite of what
4. D.
   That

________has recently been done to provide more English books for the students, a shortage of reading materials remains a serious problem.

A. What          B. Though what      C. In spite of what       D. That