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单选题
String a = “ABCD”;  String b = a.toLowerCase();  b.replace(‘a’, ‘d’);  b.replace(‘b’, ‘c’);  System.out.println(b);   What is the result? ()
A

 abcd

B

 ABCD

C

 dccd

D

 dcba

E

 Compilation fails.

F

 An exception is thrown at runtime.


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