问题
                    
There is ________ useful book on the desk, _________ useful book belongs to my brother.
                            A:a; the
B:an; the
C:a; an
D:an; a
                        
                        B:an; the
C:a; an
D:an; a
正确答案是:
                        
                        
                        
                    同类题型
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