We often see the old man sit there.转换成The old man is often_____ _____ sit there. go on doing=?今天要
问题描述：
We often see the old man sit there.转换成The old man is often_____ _____ sit there. go on doing=?
今天要
答
seen to,
go on doing = continue doing = keep doing
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答
seen to
go on doing 继续做...
答
seen to
be seen to do sth.被看见做某事