It took the old man three days to finish the work. 那个老人花了三天时间完成这项工作。 29keep (on) doing sth. 一直坚持做某事 keep doing sth.一般用于静态动词。keep on doing s...
go on doing继续干某事,不停地干某事 go on with 继续 go out 出去,熄灭 go over 仔细检查,复习 go through 浏览;翻阅,通过
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