问题
                    
Every morning Mr. Smith takes a ______ to his office.
                            A:20 minutes’ walk
B:20 minute’s walk
C:20-minutes walk
D:20-minute walk
                        
                        B:20 minute’s walk
C:20-minutes walk
D:20-minute walk
正确答案是:
                        
                        
                        
                    同类题型
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