When I reached the farm, my son happened ________ on the grass, ________ the hens________ eggs.

A. lying; watching; laying               B. to have lain; watch; laying

C. to lie; and watched; lay              D. to be lying; watching; laying

When I reached the farm, my son happened ________ on the grass, ________ the hens ________ eggs．

1. A.
   lying; watching; laying
2. B.
   to have lain; watch; laying
3. C.
   to lie; and watched; lay
4. D.
   to be lying; watching; laying