As a child, Johnson would sit on the steps alone, _______ the sun ______ down.

1. A.
   watched; going
2. B.
   watching; went
3. C.
   watching; go
4. D.
   watched; went

As a child, Johnson would sit on the steps alone, _______ the sun ______ down.

 As a child, Johnson would sit on the steps alone, _______ the sun ______ down.