问题
                    
To succeed in doing an experiment,________.
                            A:carefulness is needed
B:carefulness is one needs
C:one needs to be careful
D:one need be careful
                        
                        B:carefulness is one needs
C:one needs to be careful
D:one need be careful
正确答案是:
                        
                        
                        
                    同类题型
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