问题
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
B: to have lain; watch; laying
C: to lie; and watched; lay
D: to be lying; watching; laying
正确答案是：
