下列的( )程序段可能导致错误。A.String s="hello": Sting t="good"; String k=s+t;B.Sting s="hello"; String t; t=s [3] + "one";C.Sting s="hello"; String standard=s.toUpperCase( );D.String s="hello": Stringt s +"good";

下列的( )程序段可能导致错误。

A.String s="hello": Sting t="good"; String k=s+t;

B.Sting s="hello"; String t; t=s [3] + "one";

C.Sting s="hello"; String standard=s.toUpperCase( );

D.String s="hello": Stringt s +"good";


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