—Has Billy finished his homework today?

—I have no idea.He         it this morning.

A.would do                  B.was doing                  C.has done                    D.had done

—Has Billy finished his homework today?

—I have no idea.He        it this morning.

1. A.
   would do
2. B.
   was doing
3. C.
   has done
4. D.
   had done