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【单选题】
若已从一个DataFrame对象df中选择了两部分数据（保持数据属性完整）分别存入df1和df2中，代码行如下，请从如下选项中选出可以正确合并这两部分数据的函数/方法补充完整代码。importpandasaspdpd.___________([df1,df2])A.
append
B.
concat
C.
join
D.
merge
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B.
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