问题补充：
--What did Sam say just now?
--He said he at that time.
A. watched TV
B. will watch TV
C. was watching TV
D. is watching
答案：
A. watched TV
B. will watch TV
(答案→)C. was watching TV
D. is watching
解析：萨姆刚才说什么？——他说那时他正在看电视。结合语境可知下文从句描述的是刚才正在进行的动作，故用过去进行时态。选C。
