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。
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