问题
                    
What were you up to when yourparents came in— I ____ for a while and ____ some reading
                            A:No matter what
B:No matter which C Whatever D whichever;
C:most
D:whichever;
                        
                        B:No matter which C Whatever D whichever;
C:most
D:whichever;
正确答案是:
                        