My sister should keep on _____ if she wants to be a dancer.(A.dance B.to dance C.dancing D.to dancing)为什么选C不能选A)

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My sister should keep on _____ if she wants to be a dancer.(A.dance B.to dance C.dancing D.to dancing)为什么选C不能选A)
My sister should keep on _____ if she wants to be a dancer.(A.dance B.to dance C.dancing D.to dancing)为什么选C不能选A)

My sister should keep on _____ if she wants to be a dancer.(A.dance B.to dance C.dancing D.to dancing)为什么选C不能选A)
keep on doing是坚持做.的意思 这时个固定搭配 同时,on是一个介词(prep),介词后面应该接动词的ing形式 希望可以帮到你~~~

因为on是介词

因为这个句子已经有谓语了,不能用动词原形
而且keep on 后面跟动词的 ing形式也可以当短语来记