问题
                    
_______is known to us all is that Johnson broke his promise ______ he would come to help me as soon as possible.
                            A:It; that;
B:What; that;
C:As; which;
D:What; which;
                        
                        B:What; that;
C:As; which;
D:What; which;
正确答案是:
                        