问题
                    
Jane is high school student in the United States.
                            A:an 18-year-old
B:a 18-years-old
C:an 18-years-old
D:a 18-year-old
                        
                        B:a 18-years-old
C:an 18-years-old
D:a 18-year-old
正确答案是:
                        
                        
                        
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