The problem ________ at present is the global financial turmoil(全球经济动荡)。

1. A.
   discussed
2. B.
   being discussed
3. C.
   having been discussed
4. D.
   to be discussed

The problem ______at present is the global financial turmoil. ( 全球经济动荡)

A. discussed                                B. being discussed  

C. having been discussed              D. to be discussed