=IF(ROW(A1)<=COUNTA(表2!A:A),INDEX(表2!A:A,SMALL(IF(LEN(表2!A$1:A$1000)>0,ROW($1:$1000),4^8),ROW(A1))),INDEX(表3!A:A,SMALL(IF(LEN(表3!A$1:A$1000)>0,ROW($1:$1000),4^8),ROW(A1))))按【组合键】确认后下拉填充