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【单选题】
关于以下两条语句，以下说法正确的是________。s="Programming"s[2]="g"A.
第2条语句有错误，因为字符串对象创建后其值是不能改变的。
B.
两条语句都没有错误。
C.
第1条语句有错误。
D.
两条语句都有错误。
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