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
网友回答
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。