I think Father would like to know ________ I've been up to so far, so I decide to send him a quick note.A.whichB.whyC.whatD.how
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C解析此题考查宾语从句中关联词语的用法。首先要理解be up to的意思。根据题干所给的具体情境，be up to在这里的意思是“忙于，从事于，正在做……”，后面要跟宾语，用作“up to sth.”。所以此题要选C，what作介词to的宾语。