---I ______ the book for a whole hour .
--- No wonder you look so tired.

1. A.
   have read
2. B.
   have been reading
3. C.
   read
4. D.
   are reading

----I _________ the book for a whole hour .

   ---- No wonder you look so tired .

A. have read   B. have been reading     C. read        D. are reading   

----I _________ the book for a whole hour .

---- No wonder you look so tired .

----I _________ the book for a whole hour .
---- No wonder you look so tired .