He( )working till he was seventy years old1.kept up 2.kept on 3.kept to 4.kept out

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He( )working till he was seventy years old1.kept up 2.kept on 3.kept to 4.kept out
He( )working till he was seventy years old
1.kept up
2.kept on
3.kept to
4.kept out

He( )working till he was seventy years old1.kept up 2.kept on 3.kept to 4.kept out
2 直到70岁,他一直在工作 keep on doing

kept up 跟上
kept on 继续,不断的
kept to 保持
kept out 拒之门外
选第二个kept on