问题
                    
This is ______ eraser and that’s _____ ring .
                            A:a ;a
B:an;a
C:a;an
D:an;an
                        
                        B:an;a
C:a;an
D:an;an
正确答案是:
                        
                        
                        
                    同类题型
                    Is that Lucy’s sister, Lily?—No, it _______ be her. She has gone to English.
September is month of the year.
Which floor do you live _________? —The first floor. I live _________ Room 112. [ ]
Who’s that? —My aunt. ________ is a nurse in a hospital.
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