What have you been doing 怎么用recent添

What have you been doing 怎么用recent添 what have you been doing what you have been doing - What have you been doing recently? What have you been doing late What have you been doing since we last met? Celia asks,"What have you been doing these days?" by the way,what have you been doing. have been doing 该怎么用 What have you been doing?请问have been是固定搭配啊,为什么要拆开呢,可以改成what You look so tired, what have you been doing?与you look so tir what have they been doing 是什么时态