I think Father would like to know ____ I've been up to so far,so Idecide to send him a quick note为什么用what?谁能给我说说been up to 的用法?

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I think Father would like to know ____ I've been up to so far,so Idecide to send him a quick note为什么用what?谁能给我说说been up to 的用法?
I think Father would like to know ____ I've been up to so far,so Idecide to send him a quick note
为什么用what?谁能给我说说been up to 的用法?

I think Father would like to know ____ I've been up to so far,so Idecide to send him a quick note为什么用what?谁能给我说说been up to 的用法?
因为是I have been up to what,what 可以看成是the things that.,以后你就这样代入,看看读上去通不通,句子是否残缺,如果没有残缺了,就是用what
sb have been up to sth就是某人最近一直忙于做某事

单独使用的what也往往具有特指性,而加了后缀-ever的whatever则往往具有非特指性。