问题
                    
Excuse me. Where is the museum?—It is quite far. It will take you half ___ hour to go there by _____bus.
                            A:an; /
B:an; a
C:a; /
D:/; /
                        
                        B:an; a
C:a; /
D:/; /
正确答案是:
                        
                        
                        
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