txt1="Whatavery"；txt2="niceday"；txt3=txt1+txt2；输出结果正确的是（）. A: niceday B: niceaday C: Whataveryniceday D: Whataniceday
txt1="Whatavery"；txt2="niceday"；txt3=txt1+txt2；输出结果正确的是（）. A: niceday B: niceaday C: Whataveryniceday D: Whataniceday
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