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

问题补充：

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

A. watched

B. to watch

C. was watching

D. watching

答案：

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。