问题
                    
It took him ____ to find the key to the drawer.
                            A:one and half hours
B:one and a half hours
C:one and a half hour
D:one and half hour;
                        
                        B:one and a half hours
C:one and a half hour
D:one and half hour;
正确答案是:
                         
                        
                        
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