问题
                    
He refused to give up _____,_____we explained that it was bad for his health.[ ]
                            A: to smoke ; nomatter how
B: smoking; no matter what
C: smoking; no matter how
D: to smoke; no matter what
                        
                        B: smoking; no matter what
C: smoking; no matter how
D: to smoke; no matter what
正确答案是: