问题
                    
David, how old is your father this year? – ———— And we just had a special party for his _____ birthday last weekend.
                            A:Fortieth; forty
B:Forty; forty
C:Forty; fortieth
D:Fortieth; fortieth
                        
                        B:Forty; forty
C:Forty; fortieth
D:Fortieth; fortieth
正确答案是: