注:catch sb up 常可与 catch up with sb 互换。如:
You go ahead and I will catch you up [catch up with you]later. 我一会儿就会赶上你的。
6 . catch up on sth 赶做,弥补。如:
Ive a lot of work to catch up on. 我有很多工作要赶做。
I have to catch up on writing letters tonight so I cant go out. 今晚我要赶写几封信,所以不能出去。
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2016-02-29
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