单项选择题
What is the result？（）
A.23 B.234 C.235 D.2345 E.2357 F.Compilation fails.
What is the result as follows？（）
A.5，6 B.5，5 C.6，5 D.6，6
What is the result when the go() method is invoked？（）
A.00 B.0001 C.000120 D.00012021 E.Compilation fails. F.An exception is thrown at runtime.
A.2 B.3 C.1，2 D.2，3 E.1，2，3
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