He is a hard-working boy.He kept on( )his homework( )A.doing;all day B.to do;all the day C.doing;all the day D.to do;all day

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He is a hard-working boy.He kept on( )his homework( )
A.doing;all day B.to do;all the day C.doing;all the day D.to do;all day

A

A

选A
keep on doing sth 坚持做某事
all day 整天

A
翻译 ON后面接动名词(-ing)