问题补充:
---Huck, how old is your mother this year?
---. And we had a party for her birthday last weekend.
A. Fortieth, forty
B. Forty, forty
C. Forty, fortieth
D. fortieth, fortieth
答案:
A. Fortieth, forty
B. Forty, forty
(答案→)C. Forty, fortieth
D. fortieth, fortieth
解析:句意:你的妈妈今年多大了?四十岁,上周末,我们为她举行了四十岁的生日。基数词表示数量。序数词表示顺序。故选C。