问题
Peter, how old is your father this year— _____. And we just had a party to celebrate his ______ birthday last weekend.
A:Fortieth; forty
B:Forty; fortieth
C:Fourty; Fourtieth
D:Fortieth; fortieth;
B:Forty; fortieth
C:Fourty; Fourtieth
D:Fortieth; fortieth;
正确答案是：
