(单选题)19: 执行下列程序段后，串X的值为S=〞abcdefgh〞;T=〞xyzw〞;substr (X,S,2,strlen(T));substr (Y,S, stelen(T),2);strcat (X,Y);
A: 〞cdefgh〞
B: 〞cdxyzw〞
C: 〞cdefxy〞
D: 〞cdefef〞
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