He sat on the sofa and watched his wife _____happily.

问题描述:

He sat on the sofa and watched his wife _____happily.
A.dance B.danced C.dancing D.to dance

C.dancing watch sb do 看见某人做了某事情
watch sb doing 看见某人正在做某事情
根据句子意思 应该是看见他的妻子欢乐的跳舞.