I haven't seen you for a couple of days. What have you been up ________.
A.inB.withC.forD.to在线课程D
【巧解导析】What's up? 表示“怎么回事？”；What are you up to? 表示“你在干什么？”，句中up是副词，to为介词，后面直接接名词．不能说up to do或up to doing，句中的to也不能改为for，with或其他介词．
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