As a child Johnson would sit on the steps alone the sun down.A. watched; goingB. watc

问题补充：

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

A. watched; going

B. watching; went

C. watching; go

D. watched; went

答案：

A. watched; going

B. watching; went

(答案→)C. watching; go

D. watched; went

解析：考查分词用法。第一空使用现在分词在句中做伴随状语，第二空是固定结构watch sb/sth do sth看见某人/某物做了某事（指看见事情发生的全程）；句意：当他是一个孩子的时候，Johnson经常一个人坐在台阶上，看着太阳落山。