The little boy fell asleep while TV. So his mother sent him to bed at once.A. watchedB. to

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A. watched
B. to watch
C. was watching
(答案→)D. watching
解析：    
试题分析:考查非谓语动词。此处是“While+分词” 结构做状语，句子主语the little boy和watch是主动关系，所以用现在分词。此句也可以看作是状语从句while he was watching TV的省略。句意：这个小男孩看着电视就睡着了。于是他母亲立刻就让他去睡觉了。