填空题3. string foo = “ABCDE”;  4. foo.substring(3);   5. foo.concat(“XYZ”);   6.   Type the value of foo at line 6.()

填空题
3. string foo = “ABCDE”;  4. foo.substring(3);   5. foo.concat(“XYZ”);   6.   Type the value of foo at line 6.()

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