单项选择题 Given a class Repetition: Which code should be inserted at line 1 of Demo.java to compile and run Demo to print "pizzapizza"?（）

单项选择题 Given: Which code fragment, inserted at line 23, allows the code to compile?（）

单项选择题 Given: Which regular expression, inserted at line 12, correctly splits test into "Test A", "Test B", and "Test C"?（）