问题
                    
It’s ______ exciting thing for ______eight-year-old girl to find _______ UFO.
                            A:a; a; a
B:an; an; a
C:an; a; an
D:a; an; an
                        
                        B:an; an; a
C:an; a; an
D:a; an; an
正确答案是:
                        
                        
                        
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