问题
                    
There is ___________ “s” and __________ “u”in _______word “student”.
                            A:a, a, an 
B:an, an, the
C:a, an, a
D:an, a, the
                        
                        B:an, an, the
C:a, an, a
D:an, a, the
正确答案是:
                        